Portsmouth, New Hampshire Water Quality Report
Water quality data for 10 water systems serving 44,419 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 10.0 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 100% | Near guideline |
| PFBA | 0.015 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFBS | 0.009 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHpA | 0.003 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxA | 0.006 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxS | 0.005 | 0.010 ug/L | 0.001 ug/L(EWG) | 50% | Within limit |
| PFOA | 0.007 | 0.004 ug/L | 0.090 ug/L(EWG) | 175% | Above limit |
| PFOS | 0.005 | 0.004 ug/L | 0.300 ug/L(EWG) | 125% | Above limit |
| PFPeA | 0.007 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
Recommended Water Filters
Based on the contaminants detected in your water supply, these filtration systems are recommended:
Reverse Osmosis (RO)
Reverse osmosis systems remove up to 99% of PFAS compounds. Recommended for homes with detected PFAS.
Up to 99% PFAS removal
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Compliance & Violations
Resolved Violations (500)
66
Oct 1, 2024
66
Oct 1, 2024
1A
Oct 1, 2023 — Nov 1, 2023
1A
Oct 1, 2023 — Nov 1, 2023
1A
Oct 1, 2023 — Nov 1, 2023
+ 495 more resolved violations
Frequently Asked Questions
Is Portsmouth tap water safe to drink?
Portsmouth's water has 2 contaminants detected above EPA limits. While the water is treated, residents may want to consider additional filtration.
What contaminants are in Portsmouth tap water?
9 contaminants have been detected in Portsmouth's water supply across 10 water systems. See the full contaminant table above for details.
How can I improve my water quality in Portsmouth?
Install a water filter rated for the specific contaminants found in Portsmouth's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Portsmouth have any water quality violations?
Yes, Portsmouth currently has 21 active violations. See the violations section above for details.