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Safety Grade
We compute an overall water quality grade based on violations and health risks, not just legal compliance.
Health Context
Every contaminant comes with plain-English health effects, who's most at risk, and what to do.
Violation History
See every time your water exceeded legal limits or missed required testing, up to 10 years back.
Recommendations
Get specific, actionable suggestions: a filter type, a test kit, or nothing at all.
About this data: ClearWater uses the EPA's Safe Drinking Water Information System (SDWIS). Data is for public water systems only; private wells are not included. Legal limits (MCLs) are minimum standards; some contaminants may still pose health risks below legal thresholds.
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TEWKSBURY WATER DEPARTMENT
TEWKSBURY, MA · 31,342 people served · Surface Water
Data last updated: 2026-06-23
5 total violations on record. No currently active health-based violations.
Health-Based Violations
- Contaminant #2950: MCL (Resolved)
- Contaminant #2950: MCL (Resolved)
- Contaminant #2950: MCL (Resolved)
- Contaminant #2950: MCL (Resolved)
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TEWKSBURY WATER DEPARTMENT: Frequently Asked Questions
Is TEWKSBURY WATER DEPARTMENT water safe to drink?
TEWKSBURY WATER DEPARTMENT has had 1 health-based violation in the last 5 years. The system generally meets EPA standards. Review the violation history below for details.
What violations has TEWKSBURY WATER DEPARTMENT had?
Recent health-based violations at TEWKSBURY WATER DEPARTMENT include: Contaminant #2950, Contaminant #2950, Contaminant #2950. See the full violation history on this page for dates, status, and details.
Does TEWKSBURY WATER DEPARTMENT water have lead?
Lead in drinking water typically comes from household plumbing, not from TEWKSBURY WATER DEPARTMENT's treatment plant. See the Lead & Copper section on this page for the most recent 90th-percentile lead test results. If your home was built before 1986, consider running cold water for 30 seconds before drinking and using an NSF/ANSI 53-certified filter.
Related water quality pages
PFAS / Forever Chemicals
EPA UCMR5 monitoring data (2023–2025). 3 PFAS compounds detected.
| Compound | Detected | EPA MCL | Status |
|---|---|---|---|
| PFOA | 0.005 µg/L | 0.004 µg/L | OVER LIMIT |
| PFHxA | 0.004 µg/L | - | No federal MCL |
| PFPeA | 0.004 µg/L | - | No federal MCL |
Source: EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR5). MCLs finalized April 2024. Values shown are the maximum detected concentration across all sampling events.
Water Hardness
Hardness is not a health concern — it is a measure of dissolved calcium and magnesium.
Water pH Level
Estimated based on USGS water monitoring data for your county.
Source: USGS National Water Information System. EPA secondary standard for pH is 6.5–8.5. Contact your water utility for exact values.
Lead & Copper
What To Do
Violations
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