Strafford County Water Quality: 4 Cities Ranked by the Records
Strafford County, New Hampshire: 4 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
Highest result for each contaminant
One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.
LithiumDetected in 1 system of 4 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest21.4 µg/L
- DOVER WATER DEPT21.4 µg/LSample date: 2024-07-11 to 2025-02-12
- ROCHESTER WATER DEPTNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-09-05 to 2025-06-10
- SOMERSWORTH WATER WORKSNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-03-08 to 2023-12-13
- UNH/DURHAM WATER SYSNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-02-14 to 2023-11-20
Lead (90th percentile)Detected in 2 systems of 4 tested15 µg/L federal action level · US EPAHighest2 µg/L
- ROCHESTER WATER DEPT2 µg/LMonitoring period: 2021–2023
- DOVER WATER DEPT1 µg/LMonitoring period: 2024–2024
- SOMERSWORTH WATER WORKSNot detectedMonitoring period: 2021–2023
- UNH/DURHAM WATER SYSNot detectedMonitoring period: 2022–2024
29 PFAS tested, none detected in any systemShow
Tested in these 4 systems: DOVER WATER DEPT, ROCHESTER WATER DEPT, SOMERSWORTH WATER WORKS, UNH/DURHAM WATER SYS
- 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
- 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Perfluoro-3-methoxypropanoic acid (PFMPA)
- Perfluoro-4-methoxybutanoic acid (PFMBA)
- Perfluorobutanesulfonic acid (PFBS)
- Perfluorobutanoic acid (PFBA)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorohexanesulfonic acid (PFHxS)
- Perfluorohexanoic acid (PFHxA)
- Perfluorononanoic acid (PFNA)
- Perfluorooctanesulfonic acid (PFOS)
- Perfluorooctanoic acid (PFOA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluoropentanoic acid (PFPeA)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.
0of 4 cities above the 15 µg/L action level
Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.
Lead in New HampshireLargest water systems
- DoverDOVER WATER DEPT · NH065101029,000 served
- RochesterROCHESTER WATER DEPT · NH200101025,000 served
- DurhamUNH/DURHAM WATER SYS · NH069101016,000 served
- SomersworthSOMERSWORTH WATER WORKS · NH215101012,200 served
Frequently asked
How does Strafford County tap water compare across cities?
PurityMap ranks 4 cities in Strafford County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Durham's main water system: UNH/DURHAM WATER SYS · PWSID NH0691010 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.
How many Strafford County cities had a PFAS sample above a 2024 EPA limit?
None of the 4 Strafford County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 0.
Is there lead in Strafford County tap water?
Utilities report lead as a 90th-percentile result from home taps. 2 of 4 Strafford County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
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