Portsmouth Water Quality
New Hampshire
According to EPA SDWIS, Portsmouth, New Hampshire is served by 11 community water systems covering about 43,892 people. The same extract lists 10 health-based violation records, most recently coded 4000 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Portsmouth, New Hampshire is delivered through 11 EPA-regulated community water systems serving an estimated 43,892 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 10 violation records across the 11 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 4 distinct EPA contaminant codes: Gross Alpha, Excl. Radon and U, Revised Total Coliform Rule, Groundwater Rule, Lead and Copper Rule. 8 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the New Hampshire drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| PORTSMOUTH WATER WORKS | 33,000 | 0 | Clean |
| PEASE TRADE PORT | 9,900 | 0 | Clean |
| HEMLOCK HAVEN | 207 | 2 | Health |
| TOP NOTCH CONDOS | 163 | 2 | Health |
| COW HILL WELLHOUSE | 150 | 1 | Health |
| PIPER MEADOWS PRIVATE COMMUNTY | 125 | 3 | Health |
| BLUEBERRY VILLAGE CONDOS | 110 | 0 | Clean |
| CEDAR CREEK | 105 | 1 | Health |
| FOUR SEASONS MOBILE HOME PARK | 55 | 0 | Clean |
| HIGH PASTURES AT BLACK MTN | 47 | 0 | Clean |
| CEDAR WOOD ESTATES | 30 | 1 | Health |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| PIPER MEADOWS PRIVATE COMMUNTY | Gross Alpha, Excl. Radon and U | 2025-10-01 |
| HEMLOCK HAVEN | Revised Total Coliform Rule | 2023-10-01 |
| HEMLOCK HAVEN | Revised Total Coliform Rule | 2023-10-01 |
| CEDAR WOOD ESTATES | Revised Total Coliform Rule | 2018-11-01 |
| PIPER MEADOWS PRIVATE COMMUNTY | Groundwater Rule | 2018-10-18 |
| TOP NOTCH CONDOS | Lead and Copper Rule | 2016-10-08 |
| TOP NOTCH CONDOS | Lead and Copper Rule | 2015-10-08 |
| COW HILL WELLHOUSE | Groundwater Rule | 2015-01-16 |
| PIPER MEADOWS PRIVATE COMMUNTY | Groundwater Rule | 2013-06-30 |
| CEDAR CREEK | Lead and Copper Rule | 2010-12-11 |
What are Portsmouth's health-based records for?
Portsmouth's health-based violation records carry 4 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Groundwater Rule | 3 | 2 |
| Lead and Copper Rule | 3 | 2 |
| Revised Total Coliform Rule | 3 | 2 |
| Gross Alpha, Excl. Radon and U | 1 | 1 |
TRI Facilities in Portsmouth
| Facility | Total Releases |
|---|---|
| Lonza Biologics Inc. | 155.7K lbs |
| Schiller Station | 16.2K lbs |
| Epredia | 3.8K lbs |
| Irving Oil Terminals Inc. | 1.6K lbs |
| Gold Bond Building Products - Portsmouth | 15 lbs |
| Pike Industries Inc. - Portsmouth | 2 lbs |
| Maclellan Concrete Co. Inc. | 0 lbs |
| US Dod Usaf Pease Ang | 0 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Portsmouth, New Hampshire? ▼
How many water violations does Portsmouth have in this EPA extract? ▼
What contaminants were found in Portsmouth water? ▼
How many water systems serve Portsmouth? ▼
Where does Portsmouth get its drinking water? ▼
Are there pollution sources near Portsmouth? ▼
How does Portsmouth compare in New Hampshire?
Of the 179 New Hampshire places with at least one community water system on file, Portsmouth ranks #11 by number of systems (11).
Either side of it: Concord (13), Glen (11), Belmont (10), Campton (10)
About This Data
Figures here are the current EPA SDWIS extract joined to the 11 community water systems whose service area lists Portsmouth, ranked against the 179 New Hampshire places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.