Well Water Testing and Disclosure for Rentals, Sales, and Service Contractors

A homeowner calls a water-service contractor three days before closing:

The buyer needs the well to pass. Please take a sample and send me a certificate.

That request hides nearly every decision that matters.

Which law, contract, lender, or health authority requires the test? Which contaminants are required? Must the sample represent untreated groundwater, finished water at the kitchen tap, or water after treatment? May this contractor collect it? Must an independent or state-certified sampler do so? Which laboratory is certified for each method? Is a chain-of-custody form required? How quickly must the sample arrive? Who receives the result? Does an exceedance delay closing, trigger a notice, require alternative drinking water, or only require disclosure?

There is no useful universal well passed certificate.

A defensible well-water service record identifies the regulatory and transaction purpose, the well and sample point, the analyte panel, the authorized sampler, the certified laboratory, collection and custody controls, the exact report recipients, the comparison criteria, the limits of interpretation, and the response to an invalid sample or concerning result.

This guide addresses private domestic wells in the United States. A well serving multiple connections or a non-household use—such as a commercial, lodging, food-service, childcare, workplace, or shared property—may fall within a public-water-system definition or another regulated category, depending on the people served, connections, use, and state or local rules, even if the owner calls it private. State and local requirements vary and change. This is operational documentation guidance, not medical, environmental-engineering, hydrogeologic, real-estate, or legal advice.

Use Documentorium for the service scope and customer record, while preserving the laboratory's report and any government or transaction form unchanged. Put the stated purpose, authority or contract reference, property and well ID, system diagram, sample point, treatment status, sampler role, laboratory, panel, recipients, timing, and limits in the quote estimate and contract agreement. Issue a work order with the approved sampling plan and custody instructions, then use the service report for what actually happened, exceptions, laboratory accession reference, and next step. The well-pump service-report guide shows how water quality remains separate from equipment condition, pressure, and yield.

Determine whether the source is actually a private well

The CDC's well-testing guidance explains that the EPA rules protecting public drinking-water systems do not apply to privately owned wells in the same way, and that owners are responsible for testing and maintenance. The EPA's public-water-system overview is the useful classification checkpoint before a contractor treats a source as an individual household well.

Do not stop at the property label. Record:

• well owner;
• parcels and buildings served;
• number of service connections;
• people served and days per year;
• residential, rental, commercial, institutional, agricultural, food-service, childcare, lodging, or mixed use;
• shared-well agreement;
• source type: drilled, driven, dug/bored, spring, cistern, hauled water, or combined source;
• treatment and storage configuration;
• state well ID, tag, log, or permit information;
• public-water-system ID, if any;
• authority that confirmed classification.

For the federal baseline, EPA defines a public water system as a system that provides water for human consumption through pipes or other constructed conveyances to at least 15 service connections, or that serves an average of at least 25 people for at least 60 days per year. CDC notes that EPA rules protecting public systems do not apply to privately owned wells in the same way; state and local rules may cover additional systems. A duplex on one well, a short-term-rental complex, campground, restaurant, workplace, school, or mobile-home property may need a classification review.

Useful contract language:

Price assumes the source is an individual domestic well serving the identified residence only. Customer will disclose every additional connection and non-household use. If the source is or may be a public, semi-public, transient, shared, regulated rental, food-service, childcare, lodging, or workplace water system, sampling will pause until the responsible authority and required program are identified.

Do not use a household-well panel or homeowner collection method for a regulated system without confirming that program's requirements.

Name the purpose before choosing a test panel

The same well can require different samples for different decisions.

Do not sell a broad complete water test without listing every analyte. No practical panel tests for everything that could be present. Conversely, do not test only for bacteria when the actual concern is a fuel release, arsenic-prone geology, nitrate near agriculture, lead from plumbing, or PFAS near a known source.

The service agreement should attach a panel matrix:

The comparison basis is not permission for an unqualified contractor to make a medical diagnosis. It tells the reader why the test was ordered and which authority should interpret the result.

Treat federal annual guidance as a baseline, not a transaction rule

The CDC's current guidance and the EPA's private-well guidance recommend testing a private well at least annually for:

• total coliform bacteria;
• nitrate;
• total dissolved solids; and
• pH.

They also recommend asking the state or local health/environmental department which additional germs and chemicals matter in the area. Potential additions can depend on geology, nearby agriculture, septic systems, industrial or fuel sites, waste disposal, flooding, household vulnerability, plumbing, and known local contamination.

Testing should also be considered after:

• flooding, wildfire, or other disaster;
• a well, pump, casing, cap, plumbing, or treatment repair;
• loss of pressure;
• a change in taste, odor, color, or clarity;
• notice of a nearby groundwater problem;
• land disturbance or a new contamination source;
• unexplained gastrointestinal illness after consultation with health professionals;
• pregnancy, nursing, or an infant/young child joining the household;
• treatment installation or maintenance;
• a materially changed result in a nearby well.

Those recommendations do not replace a state's sale panel, a landlord's statutory schedule, a lender's independent-sampling rule, or an emergency health directive. Put each authority in a separate row rather than blending them into a made-up national standard.

Use a current state and transaction matrix

Before quoting a sale or rental sample, check:

1. state statute and regulations;
2. state environmental and health-agency instructions;
3. county, tribal, municipal, or health-district rules;
4. purchase contract and addenda;
5. lease and landlord obligations;
6. lender, insurer, grant, or assistance-program requirements;
7. laboratory and collector certification rules;
8. well-construction or repair permit conditions;
9. reporting, privacy, and notification duties;
10. current deadlines and result-validity periods.

Use a matrix like this:

New Jersey shows why sampler authority matters

New Jersey's current Private Well Testing Act guidance is not simply get a water test.

NJDEP explains that covered property sales require testing of untreated groundwater for the specified PWTA panel, receipt and review by buyer and seller before closing, and signed evidence that they received and reviewed the result. Covered landlords must test every five years, pay for testing, and provide the most recent result to each lessee as required.

NJDEP also states that a PWTA sample must be collected by a person certified to collect PWTA samples or by an authorized laboratory representative. The pH sample has an additional laboratory-qualification rule: current NJDEP guidance requires collection by an employee or authorized representative of a laboratory certified to test pH. If treatment is present, the required transaction sample is taken before treatment.

That means a plumber, home inspector, treatment salesperson, real-estate agent, or general service contractor cannot assume that ordinary access to the faucet authorizes collection.

Oregon uses a different sale framework

The Oregon Health Authority's current Domestic Well Testing Act guidance requires a seller in a covered real-estate transaction to test the domestic well for arsenic, nitrate, and total coliform bacteria and provide results under its reporting process. The same guidance identifies exemptions for spring sources, irrigation-only wells, and wells on undeveloped land.

OHA says the sample may be collected by a water professional or by anyone able to follow OHA's instructions, but it must be analyzed by an accredited laboratory. The posted instructions say to get the water-test sample to the laboratory as soon as possible, within 24 hours of collection, and that the result is valid for one year.

OHA's guidance gives the seller or chosen representative 90 days to provide a copy to the potential buyer and send the RET form plus result to OHA. Confirm the current OHA instructions before relying on those periods or exemptions.

Oregon does not become the template for New Jersey, and New Jersey does not become the template for Oregon. The examples prove the need for a jurisdiction-specific worksheet.

Rental obligations need their own row

Do not assume that a sale test satisfies a landlord indefinitely. Rental rules may specify:

• test interval;
• new-tenant disclosure;
• current-tenant notice after results;
• landlord payment responsibility;
• untreated versus delivered-water sample;
• additional panel in a designated area;
• alternative-water or remediation duty;
• record retention;
• local housing-code inspection.

The service contractor should identify the rule and fulfill only its assigned task. It should not tell a landlord that a property is lawful to rent unless that conclusion is within the contractor's licensed and contracted role.

Decide whether you are the sampler

There are seven distinct roles in this workflow:

You are the sampler only when all gates are satisfied

• the governing program permits your role;
• required personal/company certification or authorization is current;
• the laboratory accepts you as a collector for the requested method;
• the sample point and method are within your training;
• the correct laboratory kit, containers, preservatives, blanks, labels, and custody forms are available;
• holding time and transport can be met;
• the owner has authorized access and disclosure;
• conflicts and independence requirements are addressed;
• your insurance and service scope cover the work.

If one gate fails, coordinate an authorized sampler instead.

Useful quote language:

Contractor is arranging laboratory service but is not the collector of record. Sample collection, sealing, custody initiation, and method certification will be performed by [laboratory/authorized sampler]. Contractor may provide access and system identification only. Price and schedule remain subject to the laboratory's acceptance.

Or:

Contractor will act as sampler solely for the analytes and method listed in Appendix A. This service does not include laboratory analysis, selection of additional contaminants, health interpretation, regulatory approval, treatment design, or certification that the property may be sold or leased.

Define exactly which water the sample represents

Kitchen sink is not enough.

A property can have:

• raw well water;
• pressure tank water;
• sediment filtration;
• softening;
• oxidation or carbon treatment;
• reverse osmosis;
• ultraviolet or chemical disinfection;
• storage tanks;
• a bypass;
• a separate drinking-water faucet;
• mixed well and public sources;
• plumbing that changes water after it leaves the well.

Map the flow:

Well -> pump -> pressure tank -> raw sampling port -> whole-building treatment -> distribution -> kitchen tap
                                                                        -> point-of-use treatment -> drinking faucet

Then identify the decision:

Do not bypass treatment without permission or fail to restore valves. Record every valve position and treatment state. If a raw sampling port leaks, is unsanitary, or does not exist, do not improvise a transaction sample from a hose full of debris.

Tag the sample point

Record:

• sample ID;
• address, parcel, and well ID;
• building/unit served;
• room and fixture;
• fixture photograph;
• relation to pressure tank and each treatment component;
• hot/cold and dedicated/mixed status;
• aerator, hose, swivel, filter, and attachment status;
• valve and bypass positions;
• stagnation or flushing method;
• date/time and collector;
• field measurements;
• deviations.

A laboratory result follows the sample ID. It does not automatically describe every tap, both sides of treatment, or groundwater at every depth.

Let the laboratory method control collection

Different analyses require different bottles, preservatives, sample volumes, flushing or stagnation, headspace, temperature, blanks, holding times, and contamination controls. The EPA's drinking-water laboratory certification material explains the certification and approved-method context; the certified laboratory should supply or approve the kit and current instructions.

The service order should prohibit:

• transferring a sample into a household container;
• rinsing a pre-preserved bottle;
• touching the cap interior or bottle mouth;
• filling a volatile-organic vial with bubbles when the method prohibits headspace;
• placing PFAS samples near restricted materials contrary to the laboratory plan;
• collecting microbiology from a dirty swivel faucet or hose without resolving suitability;
• collecting after shock chlorination before the specified recovery period;
• leaving samples in a vehicle;
• missing the holding time;
• altering a result, label, or chain-of-custody form.

National Ground Water Association materials emphasize that samples should represent the intended water, collection should minimize contamination, and bottle, preservation, identification, and laboratory method matter. For health-related decisions, laboratory analysis—not an unvalidated field strip—should carry the result.

Write a method-specific collection plan

For each sample, include:

1. laboratory and certification scope;
2. kit lot or identifiers where provided;
3. analyte/method;
4. point and purpose;
5. pre-sampling condition;
6. treatment/valve configuration;
7. fixture preparation permitted by the method;
8. stagnation, purge, or stabilization requirement;
9. field measurements and calibration;
10. container, volume, and preservative;
11. quality-control samples;
12. labeling and seals;
13. storage temperature/light control;
14. custody transfers;
15. laboratory receipt deadline;
16. rejection and recollection process.

Do not copy the purge time from a bacteria instruction into a lead first-draw sample or a VOC method.

Preserve an auditable chain of identity and custody

Routine homeowner monitoring may use a simple lab form. A transaction, lender, dispute, enforcement, or health investigation can require more formal custody.

At minimum, record:

• unique sample ID;
• well and sample-point identity;
• requested analyses;
• date and exact collection time;
• collector name, organization, signature, and credential if required;
• fixture and treatment state;
• collection conditions and deviations;
• container count and seals;
• field results and instruments;
• preservative or lab-prepared bottle status;
• cooler or storage condition;
• every transfer, date, time, sender, and recipient;
• carrier/tracking when shipped;
• laboratory received date/time, condition, temperature, and acceptance/rejection;
• report number linked back to the sample.

Do not pre-sign blank custody forms. Do not leave an unsealed transaction sample with the seller for later delivery if the program requires an independent chain. Do not change a collection time to hide a missed holding period.

If the laboratory rejects a sample, report the rejection and recollect. A result from a compromised sample does not become valid because closing is near.

Keep well inspection, yield, and water quality separate

Water quality is one part of a private-water-system evaluation.

NGWA's annual checkup guidance recommends routine inspection by a licensed or certified water-well professional. Its annual checkup guidance includes system output, water levels when possible, pump motor performance, pressure tank/switch, sanitary condition, water-quality testing, and a written report.

Build separate workstreams:

A negative bacteria sample does not prove adequate yield. A strong flow test does not prove chemical safety. A new UV lamp does not remove nitrate or arsenic. A water softener does not establish potability.

Use a combined inspection report with separate conclusions and responsible specialists.

Do not sell “pass/fail” without defining the rule

A laboratory reports an analytical result, unit, method, reporting/detection limit, and quality information. A regulator or contract may compare that result to a standard.

Private-well reports sometimes display EPA public-water-system Maximum Contaminant Levels as reference values. That comparison can be useful, but it does not automatically mean:

• the private well is regulated as a public system;
• the sample met a state's sale or rental statute;
• no untested contaminant exists;
• the result will remain the same;
• the well construction is acceptable;
• a lender must approve the property;
• the water is safe for every person or use;
• treatment is unnecessary.

Use precise status terms:

Suggested disclosure:

Results apply only to the identified samples, points, dates, conditions, and analyses. Not detected means not detected at the laboratory's stated reporting limit; it does not mean the substance is absent at every concentration. No conclusion is made about contaminants not tested, future water quality, well yield or construction, other fixtures, or legal suitability for sale, lease, financing, occupancy, or a particular medical use.

Deliver the unaltered laboratory report

The customer should receive the complete final laboratory report, not a contractor's cropped screenshot or a retyped summary.

The service packet can include:

1. purpose and authority worksheet;
2. site/well identification;
3. sample plan and approved panel;
4. sampler credential/authorization where required;
5. chain-of-custody and lab receipt;
6. unaltered final laboratory report and amendments;
7. contractor summary clearly labeled as a summary;
8. comparison table with named source and edition/date accessed;
9. photographs and treatment configuration;
10. result delivery and acknowledgment record;
11. referrals and immediate response instructions from the appropriate authority;
12. retest or remediation proposal, separately accepted.

Do not remove qualifiers, detection limits, quality-control notes, rejected analytes, or laboratory comments because they complicate the sale.

If the laboratory issues a corrected report, preserve both versions and identify which is superseded. Notify every authorized recipient who received the earlier report.

Control who receives private results

Well results can affect health decisions, tenancy, price negotiations, lending, and regulatory follow-up. The service agreement should identify authorized recipients before collection.

Record:

• person ordering and paying;
• property owner and occupants;
• buyer/seller and agents;
• landlord/tenant;
• lender/appraiser;
• state/local agencies;
• laboratory's mandatory reporting duties;
• contractor and treatment provider;
• method of secure delivery;
• written authority for additional disclosure;
• retention period;
• correction-notice process.

Do not promise confidentiality that law or laboratory reporting rules override. Do not send results to a real-estate mailing list because one agent requested the test.

New Jersey's PWTA program, for example, requires certified laboratories to submit covered results to NJDEP, which also involves local health authorities. That mandatory flow should be disclosed before collection.

Write an urgent-result communication path

The sampler should not wait for a polished sales report when the laboratory or health authority identifies a potentially acute concern.

Predefine:

• which laboratory flags trigger immediate communication;
• primary and backup owner/occupant contacts;
• whether the laboratory also contacts an authority;
• who can issue medical/public-health instructions;
• how tenants or other users receive notice;
• alternative-water authority and responsibility;
• confirmation/recollection timing;
• documentation of calls, messages, delivery, and acknowledgment.

CDC advises using bottled water or another safe source when testing identifies harmful germs or chemicals and contacting the health/environmental department for interpretation and response. For a flooded or chemically impacted well, boiling or chlorination may not address chemical contamination.

Use wording such as:

Contractor will transmit the laboratory result promptly and direct the customer to the named health authority. Contractor does not provide medical clearance. Until qualified guidance is received, the owner is responsible for implementing any laboratory or authority notice, including alternate water and occupant notification. For a rental property, identify who will confirm the landlord's statutory duties; do not treat a contractor's delivery record as a substitute for any required tenant notice.

Do not describe shock chlorination as the remedy for every positive or concerning result. Persistent bacteria can indicate a construction, surface-entry, septic, treatment, or groundwater problem. Chemical contaminants require contaminant-specific evaluation.

Separate baseline testing from treatment sales

A treatment provider may legitimately sample and design a system, but the potential conflict should be visible.

Use a staged process:

1. certified baseline sample under a documented condition;
2. qualified interpretation and confirmation where needed;
3. treatment alternatives based on contaminant, concentration, flow, chemistry, maintenance, waste stream, and certification/listing;
4. separately accepted treatment contract;
5. commissioning and post-treatment verification;
6. ongoing monitoring and maintenance plan.

Do not alter the system before a transaction's required untreated sample unless the responsible parties and program permit it. Do not present a free in-home strip test as equivalent to certified laboratory analysis.

Treatment proposal fields should include:

• contaminant and design concentration range;
• design flow and daily use assumptions;
• point of entry versus point of use;
• performance standard/listing where applicable;
• pretreatment dependencies;
• bypass and failure behavior;
• consumables, regeneration, wastewater, and disposal;
• electrical, drain, space, pressure, and freeze protection;
• alarms and monitoring;
• maintenance frequency and cost;
• initial and ongoing verification samples;
• limitations and no-treatment-without-maintenance warning.

Plan confirmation and post-work sampling

One result may need confirmation because of contamination during collection, a transient condition, laboratory quality flags, or the severity of the decision.

Create rules for:

• invalid or rejected sample;
• total-coliform-positive/E. coli result under the applicable authority protocol;
• result above a health criterion;
• detection near a decision threshold;
• inconsistent duplicate or paired samples;
• post-disinfection timing;
• post-treatment startup and media rinse;
• long-term verification;
• seasonal or event-driven retesting.

The CDC's current emergency well-disinfection guidance recommends waiting until chlorine is flushed before bacteriological testing and calls for follow-up testing after the initial post-disinfection sample. That disaster guidance should not be copied blindly into ordinary treatment work; local health instructions and the actual contamination event control.

State the decision made from each sample:

Do not warrant that a treatment device will keep water below a criterion without specified use, maintenance, monitoring, and source-water limits.

Price the documentation and logistics honestly

Laboratory work includes more than a bottle and a courier.

Quote:

• regulatory and transaction review;
• well and system mapping;
• collector qualification;
• laboratory kit and analytical fees by panel;
• field parameters and calibrated equipment;
• travel and site access;
• multiple sample points;
• blanks, duplicates, trip blanks, and other method QC when required by the method or program;
• coolers, ice, packaging, courier, and weekend constraints;
• chain-of-custody administration;
• expedited turnaround;
• state or local reporting forms;
• result summary and disclosure packet;
• health-authority coordination;
• recollection caused by customer access or changed conditions;
• recollection caused by contractor/lab error;
• well inspection, yield test, or treatment evaluation as separate services.

Example price table:

If timing is controlled by the laboratory, say estimated turnaround after accepted receipt, not a guaranteed closing-day result.

Use a stop-work and recollection clause

Stop collection when:

• property/well identity is unresolved;
• required collector is unavailable;
• customer has disinfected, serviced, bypassed, or altered treatment contrary to the plan;
• sample point is inaccessible or unsanitary;
• wrong or expired kit is present;
• laboratory cannot receive within holding time;
• power/pressure loss changes the intended condition;
• flood, fire, fuel odor, chemical event, or health alert requires authority direction;
• chain-of-custody integrity is lost;
• customer requests falsified time, point, or collector information.

State who pays for a recollection:

• contractor or laboratory error: responsible provider;
• customer no-access or undisclosed treatment: customer;
• authority or lender changes requirements: change order;
• uncontrollable courier/lab rejection: allocated under the contract;
• concerning result needing confirmation: separate authorized test unless included.

Never relabel a sample point or collection time to rescue an invalid test.

A reusable well-testing service scope

Parties and property

• customer, owner, occupant, buyer/seller, landlord/tenant, and authorized recipient;
• address, parcel, unit, well ID, and buildings served;
• source classification and known shared/public-system issues.

Purpose and authority

• routine, sale, rental, lender, permit, repair, complaint, treatment, or emergency;
• exact statute, agency instruction, contract, or program document;
• responsible party and deadline.

Panel and laboratory

• every analyte and method;
• certified laboratory scope;
• reporting limits and turnaround;
• field tests versus laboratory tests;
• quality-control samples.

Sampler and sample plan

• sampler name, role, credential, and independence;
• raw/delivered/post-treatment point;
• treatment state;
• collection instructions and laboratory kit;
• identification, custody, transport, and rejection.

Deliverables and disclosure

• custody form;
• full final laboratory report;
• transaction forms;
• factual summary and comparison source;
• recipients and secure delivery;
• mandatory agency reporting;
• acknowledgment and correction process.

Response and limits

• urgent notification route;
• authority/health referral;
• confirmation or recollection;
• alternative water responsibility;
• treatment separately authorized;
• limits of sample, panel, interpretation, and future prediction.

Price, schedule, and change control

• lab and contractor charges;
• access and customer preparation;
• turnaround estimate;
• recollection responsibility;
• added panel/point/program unit prices;
• cancellation and nonrefundable lab/courier costs.

Example service language

If treatment is proposed after testing, issue a separate option and use the water-treatment proposal guide to avoid promising a result that the selected equipment and verification plan do not support. If the work is tied to a sale, the pre-closing inspection guide helps identify open results, responsibilities, and deadlines before closing. Use the inspection report only for the contractor's own well or system observations, and a change order when the customer approves a different panel, sample point, return visit, or added service.

Purpose: Collect the private-well samples required for the identified property sale under [state/local rule] and the attached lender checklist. This service does not determine title, loan approval, or legal compliance beyond the listed collection and reporting tasks.

System: Well W-1 supplies the single residence at [address]. Customer states that no other dwelling, tenant, business, or public use is connected. Whole-house softener and ultraviolet unit are located after the pressure tank.

Panel and point: The certified laboratory will analyze [list]. If the applicable transaction program requires an untreated sample, S-1 will be collected at the photographed raw-water port after the pressure tank and before all treatment. Optional sample S-2 at the kitchen cold-water tap after treatment is for occupant information and is not a substitute for any required sample.

Collector: [name/organization] is the collector of record and will follow the laboratory kit, method, credential, sealing, and chain-of-custody requirements. Owner, seller, buyer, agent, and treatment contractor will not handle sealed samples unless the approved method and custody plan expressly allow it.

Condition: Customer will not disinfect, service, bypass, drain, or alter the well, plumbing, or treatment before collection without written coordination. Any recent work, pressure loss, flooding, fuel/chemical odor, or change in water condition must be disclosed before sampling.

Results: The laboratory will issue its complete report to the authorized recipients and any agency required by law. Contractor's summary will not replace the report. Results apply only to the identified samples and analytes. No guarantee is made about untested contaminants, future water quality, other fixtures, well construction/yield, health outcomes, property transfer, tenancy, or financing.

Concerning or invalid results: Contractor will transmit the report and refer the parties to the responsible health/environmental authority. Confirmation, alternative water, well repair, disinfection, treatment, and post-treatment testing require separate direction and authorization unless specifically included.

Well water testing and disclosure checklist

Classification and authority

• [ ] Well, parcels, buildings, connections, people, use, and days served are recorded
• [ ] Shared, rental, commercial, food, lodging, childcare, and workplace uses are disclosed
• [ ] Public/private/regulatory classification is confirmed or marked unresolved
• [ ] Sale, rental, lender, permit, complaint, routine, or treatment purpose is named
• [ ] Current state, local, tribal, lender, and contract requirements are checked
• [ ] Required panel, point, sampler, lab, timing, reporting, and result age are listed
• [ ] Responsible party for compliance is distinguished from service contractor

Sampler and laboratory

• [ ] Laboratory is certified/accredited for each required method
• [ ] Sampler is permitted and credentialed for the specific program
• [ ] Independence or disinterested-third-party requirement is satisfied
• [ ] Lab kit, bottles, preservatives, blanks, seals, and forms are current
• [ ] Method-specific instructions control collection
• [ ] Holding time and transport route are feasible
• [ ] Laboratory rejection and recollection process is accepted

System and sample point

• [ ] Well ID, address, parcel, building, and fixture are linked
• [ ] Well-to-tap treatment diagram is attached
• [ ] Raw, delivered, first-draw, post-treatment, and paired purposes are not confused
• [ ] Sample point is photographed and relation to treatment is documented
• [ ] Aerator, hose, filter, hot/cold, valve, and bypass status are recorded
• [ ] Stagnation, flushing, purge, or stabilization follows the actual method
• [ ] Recent disinfection, repair, pressure loss, flooding, or chemical event is disclosed

Custody and report

• [ ] Unique sample ID is on every container and record
• [ ] Collection time, collector, credential, point, and conditions are complete
• [ ] Custody transfers, cooler, carrier, and laboratory receipt are recorded
• [ ] Full final laboratory report and qualifiers will be delivered unaltered
• [ ] Comparison criterion and authority are named
• [ ] Not detected, present, and above criterion are used accurately
• [ ] Result limits and untested contaminants are disclosed
• [ ] Corrected reports reach every prior authorized recipient

Disclosure and response

• [ ] Owner, occupants, buyer/seller, landlord/tenant, lender, and agency recipients are authorized
• [ ] Mandatory laboratory/agency reporting is disclosed
• [ ] Secure delivery and acknowledgment are recorded
• [ ] Urgent laboratory flag has primary and backup contacts
• [ ] Health/environmental authority—not unqualified sampler—owns health advice
• [ ] Alternative water and tenant/occupant notice responsibility are assigned
• [ ] Confirmation, repair, disinfection, treatment, and verification are separate decisions
• [ ] No pass, potability, sale, lease, or future-quality guarantee is implied

Commercial terms

• [ ] Panel, points, field tests, QC, lab, courier, and paperwork are itemized
• [ ] Estimated lab turnaround begins at accepted receipt
• [ ] Expedited, weekend, and remote transport are priced
• [ ] Recollection responsibility is allocated by cause
• [ ] Added analytes, programs, wells, units, and points require authorization
• [ ] Well inspection, yield, treatment, and expert interpretation are included or excluded
• [ ] Stop-work protects identity, method, custody, and safety

Sources

Sources were reviewed September 15, 2026. Federal, state, local, lender, laboratory, and transaction requirements can change; verify the actual project before collection.

• U.S. Environmental Protection Agency — Protect Your Home's Water, last updated February 26, 2026, accessed September 15, 2026.
• U.S. Environmental Protection Agency — Information about Public Water Systems, accessed September 15, 2026.
• U.S. Environmental Protection Agency — Private Wells and Drinking Water Safety for Infants, accessed September 15, 2026.
• U.S. Environmental Protection Agency — PFAS in Private Wells, current private-well PFAS sampling, alternate-water, and treatment guidance, accessed September 15, 2026.
• U.S. Environmental Protection Agency — Laboratory Certification Manual for Drinking Water, Fifth Edition and supplements, accessed September 15, 2026.
• Centers for Disease Control and Prevention — Guidelines for Testing Well Water, July 1, 2024, accessed September 15, 2026.
• Centers for Disease Control and Prevention — Well Water Safety, accessed September 15, 2026.
• Centers for Disease Control and Prevention — How to Disinfect Wells After an Emergency, May 29, 2025, accessed September 15, 2026.
• New Jersey Department of Environmental Protection — Private Well Testing Act, current program guidance, accessed September 15, 2026.
• Oregon Health Authority — Well Testing & Regulations, current program guidance, accessed September 15, 2026.
• National Ground Water Association / WellOwner.org — Annual Water Well Inspection, professional inspection guidance, accessed September 15, 2026.
• National Ground Water Association — Water Testing and Treatment, contractor sampling guidance, accessed September 15, 2026.
• National Ground Water Association — Industry Best Suggested Practices, professional practice resources, accessed September 15, 2026.

Disclaimer

This article provides general information and does not replace professional advice for your specific situation. Verify water-quality conclusions, sampling authority, laboratory certification, treatment decisions, well construction and yield, rental and sale duties, lender requirements, permits, health guidance, and local recordkeeping rules with the applicable laboratory, public-health or environmental authority, lender, real-estate professional, licensed well or water professional, attorney, or other qualified professional before acting.