Portsmouth Drinking Water Quality
What's Really in Your Tap Water?
Good news for Portsmouth residents — your tap water meets all federal safety standards. At just 36.9 ppm (2.2 gpg), the water is pleasantly soft. Lead levels test well below the EPA action level. No violations have been recorded in the past 3 years.
Safe to Drink
Meets all EPA standards
2.2 GPG hardness
Lead
Below EPA action level
EPA action level: 15 ppb
Hardness
Soft water
US Average: 100 ppm
Is Portsmouth Tap Water Safe to Drink?
Portsmouth tap water meets all EPA health standards and is safe to drink.
- •No health-based violations in the past 3 years.
- •Lead levels are below the EPA action level.
- •For complete peace of mind, consider testing your home's water—contaminants can enter through your plumbing.
The data below shows test results from 2 water utilities serving 43K people in the Portsmouth area. Water quality testing is conducted regularly and reported to the EPA.
How Hard is Portsmouth Water?
36.9 ppm
2.2 grains per gallon
Soft water requires no treatment and is gentle on skin and appliances.
Impact on Your Home
Shower
Great for skin & hair
Kitchen
No water spots
Laundry
Clothes stay soft
Appliances
No scale buildup
Regional Comparison
Values in ppm (mg/L as CaCO₃)
Based on 21 water samples from Rockingham County.
Your pipes tell a different story
The data above shows what leaves the treatment plant—not what comes out of your faucet. Old pipes, lead solder, and building plumbing can add contaminants the city never tests for. Know exactly what's in your Portsmouth tap water.
Home test kits detect lead, bacteria, pesticides, and 100+ other contaminants. Results in 5-10 business days from certified labs.
Lead & Contaminants
Understanding lead levels and water quality violations in Portsmouth
Lead Test Results
90th Percentile Lead Level
0 ppb
Portsmouth lead levels are well within safe limits.
Regular testing is still recommended, as lead can enter water through household plumbing.
Last sampled: 2024-12-31
About Lead in Drinking Water
What is Lead in Water?
Lead is a toxic metal that can dissolve into drinking water from older pipes, solder, and fixtures. It's invisible, tasteless, and odorless, making testing the only way to detect it. The EPA has set an action level of 15 ppb, though they emphasize there is no safe level of lead exposure.
Potential Health Effects
Developmental delays, learning difficulties, lower IQ, behavioral issues
High blood pressure, kidney damage, reproductive issues
How to Reduce Exposure
- •Run water for 30 seconds to 2 minutes before drinking, especially in the morning
- •Use cold water for cooking and drinking (hot water dissolves more lead)
- •Install a NSF-certified filter designed to remove lead
- •Test your water, especially if your home was built before 1986
EPA Compliance History
Excellent Record
No violations in past 3 yearsThis utility has maintained full EPA compliance. No action needed, but regular home testing is still recommended.
3-Year Violation Summary
0
Total Violations
0
Health-Related
0
Administrative
Health-Related Violations
Contaminant exceeded EPA safety limits. May require filter or alternative water source.
Administrative Violations
Missed testing deadlines or reporting. Does not indicate water quality issues.
Who Provides Portsmouth's Water?
Utility Name
PORTSMOUTH WATER WORKS
EPA System ID (PWSID)
NH1951010
Primary Water Source
Groundwater
Population Served
43K
Frequently Asked Questions
Common questions about Portsmouth tap water quality
Nearby Cities in New Hampshire
Manchester
Soft water
Nashua
Soft water
Concord
Soft water
Hampton
Soft water
Keene
Soft water
Dover
Soft water
This data is for informational purposes only. Water quality can vary by neighborhood and building. For official reports, contact your local water utility or the EPA. Learn about our methodology