B79/100
Locust Valley Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 7,500 residents · New York
What's In Locust Valley's Tap Water?
51
Contaminants Tested
1
Exceed EPA Limits
1
Above EPA Goals
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
Water Utility Details
LOCUST VALLEY WD
Population Served
7,500
Water Source
Groundwater
System ID
NY2902833
Frequently Asked Questions About Locust Valley Water
Is Locust Valley tap water safe to drink?
Locust Valley, New York tap water receives a grade of B (79/100), which is considered good. Out of 51 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 2 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Locust Valley's water?
Of the 51 contaminants tested in Locust Valley's water supply, the most notable include PFNA, 1,4-dioxane. 1 contaminant(s) exceed EPA legal limits (MCLs). 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Locust Valley have any water quality violations?
Yes, Locust Valley has 2 EPA violation(s) on record, with the most recent in 2004. Violation types include MCL. 2 of these are health-based violations, which are the most serious category.
Do I need a water filter in Locust Valley?
Based on EPA data, using a water filter in Locust Valley is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does Locust Valley's tap water come from?
Locust Valley's drinking water is sourced from groundwater and supplied by LOCUST VALLEY WD. The system serves approximately 7,500 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Locust Valley's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Locust Valley's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Locust Valley's water compare to other cities in New York?
Locust Valley's water quality score of 79/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our New York state page to see how all cities in the state compare.
What should I do if I'm concerned about Locust Valley's water quality?
If you have concerns about Locust Valley's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (LOCUST VALLEY WD) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.