Locust Valley Water District water quality
Oyster Bay, NY · serves 7,500 people (2,465 connections) · Groundwater · Public/private · EPA ID NY2902833
Data: U.S. EPA · How we read the data · How we check it
Summary
PFAS above the 2024 federal limits. Systems have until 2029 to meet the PFAS limits.
Is it an emergency? No: PFAS limits are about years of exposure, not a glass of water, and nothing in EPA's data calls for you to stop drinking the water today. If your utility ever issues a boil-water or do-not-drink notice, follow it.
- PFAS
- Above limitPFNA, the PFAS Hazard Index above the federal limit in EPA's 2023–2025 testing (PFNA 22.1 ppt vs a limit of 10 ppt, where ppt = parts per trillion).
- Lead
- Below action level0 ppb (parts per billion) at the 90th percentile: 9 in 10 homes sampled were at or below it. Action level 15 ppb, falling to 10 ppb in Nov 2027. Monitoring period ending Dec 2023. Your home's pipes can make yours higher.
- Violations
- None health-basedNo health-based violations since 2016.
- Pregnant, or mixing baby formula with tap water? Babies drink more water for their size, so PFAS exposure matters more for them. Consider bottled water or a filter certified for PFAS for formula, and ask your doctor. Health effects.
- To lower your PFAS exposure now, a home filter certified for PFAS reduction works (reverse osmosis, or activated carbon certified to NSF/ANSI 53 or 58). Filters for these results.
- Built before 1986, or not sure what your service line is made of? Check your service line and test your tap. Utility data can't show your pipes.
- Tested your own tap? Compare your result with these numbers. Moving? Compare this system with another.
- Read Locust Valley Water District's annual water quality report (Consumer Confidence Report). It lists every regulated contaminant tested and is usually on the utility's website or mailed with your bill, and you can also request it at (516) 671-1783. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 5 entry points tested Apr 2024 to Oct 2024. "Average" is the highest entry-point average (non-detects counted as zero), the way EPA compares UCMR 5 results to the limits. ppt = parts per trillion. These results do not determine compliance.
| Contaminant | Highest average |
|---|---|
| PFOA Not detected Limit 4 ppt | – |
| PFOS Not detected Limit 4 ppt | – |
| PFHxS Detected, below limit Limit 10 ppt | 2.25 ppt 22% of the limit |
| PFNA Above limit Limit 10 ppt | 22.1 ppt 2.21× the limit |
| HFPO-DA (GenX) Not detected Limit 10 ppt | – |
| Hazard Index (a combined score for PFHxS, PFNA, GenX and PFBS, where above 1 is over the limit) Above limit Limit 1 | 2.44 |
| PFBS Not detected Guideline 2,000 ppt | – |
| PFBA Not detected Guideline 6,000 ppt | – |
| PFHxA Not detected Guideline 3,000 ppt | – |
New York has its own PFAS limits. PFOA 10 ppt (this system's highest average: not detected), PFOS 10 ppt (this system's highest average: not detected). State compliance is judged on the state's own sampling, so ask the utility or the state program whether it meets them.
For context: the PFNA average is higher than at 99% of the New York systems EPA tested.
29 PFAS tested, 2 detected at least once. "Not detected" means below EPA's reporting limit (about 2 to 20 ppt depending on the chemical), not proven zero. PFAS not listed were not detected. The limits for PFHxS, PFNA, GenX and the Hazard Index were proposed for rescission in May 2026. That proposal is not final. Systems have until 2029 to meet the limits.
Lithium
Not detected in 10 samples (reporting limit 9 ppb). About lithium.
Lead and copper
Latest 90th percentile: 0 ppb lead (Jan 2021 – Dec 2023). Below action level
Highest since 2016: 1 ppb (Dec 2017).
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2021 – Dec 2023 | 0 ppb |
| Jan 2018 – Dec 2020 | 0 ppb |
| Jan 2015 – Dec 2017 | 1 ppb |
Earlier results (6)
| Jan 2012 – Dec 2014 | 1.4 ppb |
| Jan 2009 – Dec 2011 | 1.16 ppb |
| Jan 2006 – Dec 2008 | 2.27 ppb |
| Jan 2003 – Dec 2005 | 1.08 ppb |
| Jan 2000 – Dec 2002 | 2.7 ppb |
| Jul 1992 – Dec 1992 | 3.1 ppb |
Lead comes from pipes and fixtures, not the source water, so it varies home to home. The 90th percentile means 9 in 10 sampled homes were at or below it. More on lead.
Violations
Health-based violations mean a contaminant exceeded a limit or a required treatment step was missed. Monitoring and reporting violations mean required tests or reports were late or missing, so the water's quality during that time is unknown. The total includes every violation in EPA's records, most of them paperwork.
Earlier EPA testing (2013–2020)
| Contaminant | Highest | Guideline |
|---|---|---|
| 1,4-Dioxane | 0.9 ppb | 0.35 ppb |
| Strontium | 0.1 ppm | 1.5 ppm |
| Chlorate | 95 ppb | 210 ppb |
| Manganese | 4.9 ppb | 300 ppb |
| Chromium-6 | 1.79 ppb | – |
Where it serves
Oyster Bay, Mill Neck
ZIP codes the system reported serving: 11542, 11560, 11765, 11771
Nearby utilities
- Jericho Water District Oyster Bay · same area
- Westbury Water District Westbury · 5 mi · PFAS above limit
- Roslyn Water District Roslyn · 7 mi · PFAS above limit
- Village of Williston Park Williston Park · 8 mi · PFAS above limit
- Village of Mineola Mineola · 8 mi · PFAS above limit
- Village of Garden City Garden City · 9 mi · PFAS above limit
Questions
Is Locust Valley Water District water safe to drink?
Locust Valley Water District has no health-based violations since 2016. EPA testing found PFAS above the 2024 federal limits, which systems must meet by 2029. Federal data can't tell you about your own pipes: lead comes from service lines and plumbing, so test your tap if your home was built before 1986. For the official word, read the utility's annual Consumer Confidence Report.
Does Locust Valley Water District water have PFAS?
Yes. EPA's 2023–2025 testing of Locust Valley Water District found 2 PFAS at least once. The highest entry-point averages were above the federal limit for PFNA: PFNA 22.1 ppt (limit 4 ppt for PFOA and PFOS, 10 ppt for the others).
What is the lead level in Locust Valley Water District water?
The most recent 90th-percentile lead result for Locust Valley Water District is 0 ppb, for the period ending Dec 2023. The federal action level is 15 ppb, falling to 10 ppb in November 2027. The 90th percentile means 9 in 10 homes sampled were at or below this number. Individual homes can be higher.
Check these numbers yourself
Every figure on this page comes from public EPA records. You don't have to take our word for it:
- EPA's own report for NY2902833: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID NY2902833).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask Locust Valley Water District at (516) 671-1783, or see EPA's guide to finding it.
Found something that doesn't match? Tell us and we'll check it against EPA's records. How we check our data.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.