B60/100
MAHWAH WATER DEPARTMENT — Water Quality Report 2026
Serving 26,777 people · New Jersey
Water Source
Surface Water
County
—
System ID
NJ0233001
Violations
21
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.90 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.004 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
1
Unresolved
1
Health-Related
TIER 2Unresolved
Public notification violation
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About MAHWAH WATER DEPARTMENT
Is MAHWAH WATER DEPARTMENT water safe to drink?
MAHWAH WATER DEPARTMENT water receives a grade of B (60/100), which is considered good. Out of 70 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has MAHWAH WATER DEPARTMENT detected?
70 contaminants were tested in MAHWAH WATER DEPARTMENT's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does MAHWAH WATER DEPARTMENT have any EPA violations?
Yes, MAHWAH WATER DEPARTMENT has 21 EPA violation(s) on record, with the most recent in 2025. Violation types include TT, MR, MCL. 2 are health-based violations.
How many people does MAHWAH WATER DEPARTMENT serve?
MAHWAH WATER DEPARTMENT serves approximately 26,777 people, New Jersey. The system provides water to 1 community: Mahwah Twp-0233.
What type of water does MAHWAH WATER DEPARTMENT provide?
MAHWAH WATER DEPARTMENT sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is NJ0233001.
How does MAHWAH WATER DEPARTMENT compare to other utilities in New Jersey?
MAHWAH WATER DEPARTMENT scores 60/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our New Jersey state page for a full comparison of water systems.