B79/100
LOCUST VALLEY WD — Water Quality Report 2026
Serving 7,500 people · New York
Water Source
Groundwater
County
—
System ID
NY2902833
Violations
2
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFNA | 0.015 µg/L | 0.010 µg/L | Over Limit |
1,4-dioxane | 0.439 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2004.
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 LOCUST VALLEY WD
Is LOCUST VALLEY WD water safe to drink?
LOCUST VALLEY WD water receives a grade of B (79/100), which is considered good. Out of 51 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has LOCUST VALLEY WD detected?
51 contaminants were tested in LOCUST VALLEY WD's water. Notable contaminants include PFNA, 1,4-dioxane. 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does LOCUST VALLEY WD have any EPA violations?
Yes, LOCUST VALLEY WD has 2 EPA violation(s) on record, with the most recent in 2004. Violation types include MCL. 2 are health-based violations.
How many people does LOCUST VALLEY WD serve?
LOCUST VALLEY WD serves approximately 7,500 people, New York. The system provides water to 2 communities: Oyster Bay (T), Mill Neck (V).
What type of water does LOCUST VALLEY WD provide?
LOCUST VALLEY WD sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is NY2902833.
How does LOCUST VALLEY WD compare to other utilities in New York?
LOCUST VALLEY WD scores 79/100 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.