B73/100
SUFFOLK COUNTY WATER AUTHORITY — Water Quality Report 2026
Serving 1,100,000 people · New York
Water Source
Groundwater
County
—
System ID
NY5110526
Violations
12
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2020.
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 SUFFOLK COUNTY WATER AUTHORITY
Is SUFFOLK COUNTY WATER AUTHORITY water safe to drink?
SUFFOLK COUNTY WATER AUTHORITY water receives a grade of B (73/100), which is considered good. Out of 73 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has SUFFOLK COUNTY WATER AUTHORITY detected?
73 contaminants were tested in SUFFOLK COUNTY WATER AUTHORITY's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does SUFFOLK COUNTY WATER AUTHORITY have any EPA violations?
Yes, SUFFOLK COUNTY WATER AUTHORITY has 12 EPA violation(s) on record, with the most recent in 2020. Violation types include MCL, MON, MR. 3 are health-based violations.
How many people does SUFFOLK COUNTY WATER AUTHORITY serve?
SUFFOLK COUNTY WATER AUTHORITY serves approximately 1,100,000 people, New York. The system provides water to 9 communities: Riverhead (T), East Hampton (T), Brookhaven (T), Islip (T), Southampton (T), and 4 more.
What type of water does SUFFOLK COUNTY WATER AUTHORITY provide?
SUFFOLK COUNTY WATER AUTHORITY sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is NY5110526.
How does SUFFOLK COUNTY WATER AUTHORITY compare to other utilities in New York?
SUFFOLK COUNTY WATER AUTHORITY scores 73/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our New York state page for a full comparison of water systems.