A84/100
SMITHTOWN WATER DISTRICT — Water Quality Report 2026
Serving 19,635 people · New York
Water Source
Purchased Groundwater
County
—
System ID
NY5105656
Violations
2
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
1,4-dioxane | 0.390 µg/L | — | Above Goal |
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 2015.
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 SMITHTOWN WATER DISTRICT
Is SMITHTOWN WATER DISTRICT water safe to drink?
SMITHTOWN WATER DISTRICT water receives a grade of A (84/100), which is considered excellent. Out of 66 contaminants tested, none exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has SMITHTOWN WATER DISTRICT detected?
66 contaminants were tested in SMITHTOWN WATER DISTRICT's water. Notable contaminants include Lead (90th percentile), 1,4-dioxane. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).
Does SMITHTOWN WATER DISTRICT have any EPA violations?
Yes, SMITHTOWN WATER DISTRICT has 2 EPA violation(s) on record, with the most recent in 2015. Violation types include MCL. 2 are health-based violations.
How many people does SMITHTOWN WATER DISTRICT serve?
SMITHTOWN WATER DISTRICT serves approximately 19,635 people, New York. The system provides water to 1 community: Smithtown (T).
What type of water does SMITHTOWN WATER DISTRICT provide?
SMITHTOWN WATER DISTRICT sources its water from purchased groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is NY5105656.
How does SMITHTOWN WATER DISTRICT compare to other utilities in New York?
SMITHTOWN WATER DISTRICT scores 84/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our New York state page for a full comparison of water systems.