New Hampshire Water Quality Records

NHDES records

Keep the name and PWSID together

Start with the supplier and PWSID printed on your bill or annual report. NHDES OneStop provides access to environmental records. If the service is unavailable, use the program’s records help and compare the EPA identity record with your supplier’s report. Concord Water Dept is NH0501010 in EPA’s record; NHDES source records may use 0501010 without the NH prefix.

1. Use NHDES records help to find the available public-water lookup path.
2. Compare the system name and identifier, retaining leading zeros. For Concord, the EPA record supplies an independent identity cross-check.
3. Check the record date and the type of information before interpreting a sample, facility, or compliance entry. Ask NHDES or your utility if the identity is unclear.

Open NHDES OneStop →

Read NHDES records help →

Check the Concord EPA identity record →

Annual reports

Check the reporting year inside the document

Concord’s archive explicitly labels its 2026 report as the 2025 reporting year. Dover’s 2026 report also covers 2025. Derry identifies the Core Water System in its report. Use the system ID, coverage period, and report title together; the newest-looking filename alone is not enough.

If a report is missing or difficult to use, ask the supplier for the correct system’s report, an accessible copy, or language assistance.

Find Concord’s official reports →

Find Derry’s official reports →

Open Dover’s official 2026 report →

Current instructions

Match an advisory to the exact system

Use NHDES drinking-water advisories alongside your supplier’s current messages. Match the public water system ID and affected area, and distinguish current entries from lifted or historical entries. A different system in the same town can have a different notice.

An annual report and a missing search result do not establish whether an advisory applies today. Contact your provider when the status or affected area is unclear.

Open NHDES drinking-water advisories →

Open the NHDES advisory directory →

Service-line materials

Check both the utility and property-owner portions

Concord’s service-line page separates the city-maintained pipe up to the curb box from the portion maintained by the property owner. It links inventory documents labelled November 1, 2025, notices for unknown or galvanized materials, and a material-reporting form.

An unknown material needs follow-up. An inventory describes pipe material; it is not a tap-water sample result. For another system, ask that provider how to review both portions of your service line.

Review Concord’s service-line resources →

Private-well testing

Use NHDES homeowner testing guidance

NHDES recommends regular testing for an individually owned well. Its private-well page links Water Testing Guidance for Private Well Users, which explains recommended tests and accredited laboratory options. A nearby public-system report does not test your well.

The linked Be Well Informed tool provides laboratory-result interpretation and treatment guidance. Use your own laboratory report and sample dates; keep those results separate from public-system monitoring and historical source assessments.

Find NHDES private-well testing guidance →

Open Be Well Informed →

PFAS information

Choose public-supply or private-well information

NHDES’s PFAS drinking-water page separates public water supply wells from private wells. Choose the path that matches your water source. A public-system sample and an individual household-well result answer different questions.

Check a result’s system or well identity, sample date, location, and units. The state page also includes dated regulatory history; this guide does not treat historical thresholds as current rules or infer a tap result from a source location.

Open NHDES PFAS drinking-water guidance →

Why does a 2026 report show 2025 results?

Concord and Dover publish annual reports titled 2026 for the previous calendar year’s testing. Read the coverage period inside the document and preserve any older dates attached to individual samples or assessments.

Is 0501010 the same identifier as NH0501010?

For the cited Concord system, 0501010 is the seven-digit portion and NH0501010 is the state-prefixed form used here and by EPA. Compare the official system name too, and do not substitute a facility suffix or another Concord-area record.

Does Manchester’s source description identify every Derry customer’s supply?

The Derry report cited here is for its Core Water System, NH0611010, which reports purchasing treated water from Manchester Water Works. That supports this system’s report context. It does not identify every Derry address or merge the two regulatory systems.

Does a public system supplied by wells describe my private well?

No. Dover’s report describes the public utility’s wells and monitoring. An individual household well needs its own source and testing information; proximity to a public well or aquifer does not transfer its results to your property.