Is Clarkstown, NY tap water safe?
Supplied by Veolia Water New York · serves 270,000 people (56,150 connections) · Surface water · EPA ID NY4303673
Data: U.S. EPA · How we read the data · How we check it
Most of Clarkstown gets its water from Veolia Water New York. Parts of the city are served by 3 smaller systems: Nyack Village Water Supply (14,700 people), Lake Lucille Property Owners Association (92 people), Sunrise Bungalows Water System (50 people). Your water bill names your system.
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 limitPFOA above the federal limit in EPA's 2023–2025 testing (PFOA 9.95 ppt vs a limit of 4 ppt, where ppt = parts per trillion).
- Lithium
- Above screening levelHighest result 19.1 ppb. EPA uses 10 ppb to decide what to study further. It is not a health limit, and there is no federal limit for lithium. About 1 in 4 systems tested were above it.
- Lead
- Below action level3 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 Jun 2026. Your home's pipes can make yours higher.
- Violations
- Resolved1 health-based violation since 2016, most recently Jan 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 Veolia Water New York's 2026 water quality report (PDF) (Consumer Confidence Report, from the utility). It lists every regulated contaminant tested, including ones not on this page. Questions: (845) 620-3352.
PFAS (“forever chemicals”)
EPA UCMR 5: 35 entry points tested May 2023 to Dec 2025. "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 Above limit Limit 4 ppt | 9.95 ppt 2.49× the limit |
| PFOS One sample above limit Limit 4 ppt | 3.4 ppt 85% of the limit |
| PFHxS Detected, below limit Limit 10 ppt | 3.1 ppt 31% of the limit |
| PFNA Detected, below limit Limit 10 ppt | 5 ppt 50% of 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) Detected, below limit Limit 1 | 0.5 |
| PFBS Detected, below limit Guideline 2,000 ppt | 4.35 ppt |
| PFBA Detected, below limit Guideline 6,000 ppt | 5.9 ppt |
| PFHxA Detected, below limit Guideline 3,000 ppt | 6.35 ppt |
| PFPeA Detected, no limit | 7.7 ppt |
| PFHpA Detected, no limit | 2.8 ppt |
| 6:2 FTS Detected, no limit | 6 ppt |
What the utility says it is doing: Veolia says it had placed 12 PFAS treatment systems into service in Rockland County as of mid-2026. Wells VW 55 and VW 66 exceeded the state PFOA limit in Q2 2026, and treatment design for that site is under development.
Source: Veolia Water New York PFAS Progress Report, Rockland County, 2nd Quarter 2026, 2026-07-13. Collected by us on Nov 14, 2026, not from EPA's data. Ask the utility for the latest.
New York has its own PFAS limits. PFOA 10 ppt (this system's highest average: 9.95 ppt), PFOS 10 ppt (this system's highest average: 3.4 ppt). 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 PFOA average is higher than at 99% of the New York systems EPA tested.
29 PFAS tested, 10 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
Detected in 21 of 73 samples. Highest result 19.1 ppb. EPA's non-enforceable screening level is 10 ppb. Above screening level The screening level is how EPA decides what to study further, not a health limit. There is no federal limit for lithium and no filter is certified to remove it. About lithium.
Lead and copper
Latest 90th percentile: 3 ppb lead (Jan 2026 – Jun 2026). Below action level
Highest since 2016: 5.8 ppb (Dec 2022).
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2026 – Jun 2026 | 3 ppb |
| Jan 2025 – Jun 2025 | 3 ppb |
| Jul 2023 – Dec 2023 | 3 ppb |
Earlier results (9)
| Jan 2023 – Jun 2023 | 4.33 ppb |
| Jul 2022 – Dec 2022 | 5.8 ppb |
| Jan 2022 – Jun 2022 | 0 ppb |
| Jul 2021 – Dec 2021 | 3.7 ppb |
| Jan 2021 – Jun 2021 | 3.5 ppb |
| Jul 2020 – Dec 2020 | 2.9 ppb |
| Jan 2020 – Jun 2020 | 3 ppb |
| Jul 2019 – Dec 2019 | 2.8 ppb |
| Jan 2019 – Jun 2019 | 0.2 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
| When | What happened |
|---|---|
| Jan 2016 | The running annual average for TTHM was above the legal limit. EPA record: TTHM · Maximum Contaminant Level Violation, Average · measured 84.2 ug/l (limit 0.080 mg/L) Archived |
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 |
|---|---|---|
| Manganese | 290 ppb | 300 ppb |
| Vanadium | 5.1 ppb | 21 ppb |
| Molybdenum | 1.4 ppb | 40 ppb |
| 1,4-Dioxane | 0.5 ppb | 0.35 ppb |
| Chlorate | 1,000 ppb | 210 ppb |
| Strontium | 0.57 ppm | 1.5 ppm |
| Chromium-6 | 3.4 ppb | – |
Where it serves
Clarkstown
27 ZIP codes the system reported serving
10901, 10911, 10913, 10920, 10923, 10927, 10931, 10952, 10954, 10956, 10960, 10962, 10964, 10965, 10968, 10970, 10974, 10976, 10977, 10980, 10982, 10983, 10984, 10986, 10989, 10993, 10994
Nearby utilities
- Nyack Village Water Supply Nyack · 4 mi · PFAS above limit
- Suffern Village Water System Ramapo · 7 mi · PFAS above limit
- Yeshiva Farm Settlement Water System New Castle · 11 mi · PFAS above limit
- Yorktown Consolidated Water District #1 Yorktown · 12 mi · PFAS above limit
- White Plains City Water System White Plains · 14 mi
- City of Yonkers Yonkers · 14 mi
Questions
Is Clarkstown tap water safe to drink?
Most of Clarkstown gets its water from Veolia Water New York. Veolia Water New York had 1 health-based violation since 2016, all since resolved. 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 Clarkstown water have PFAS?
Yes. EPA's 2023–2025 testing of Veolia Water New York found 10 PFAS at least once. The highest entry-point averages were above the federal limit for PFOA: PFOA 9.95 ppt (limit 4 ppt for PFOA and PFOS, 10 ppt for the others).
What is the lead level in Clarkstown water?
The most recent 90th-percentile lead result for Veolia Water New York is 3 ppb, for the period ending Jun 2026. 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 NY4303673: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID NY4303673).
- EPA SDWIS download: the lead results, population and violation records we use.
- Veolia Water New York's 2026 water quality report (PDF): the utility's own annual report, including contaminants EPA's national database doesn't carry (link checked Nov 14, 2026). Phone: (845) 620-3352.
- Veolia Water New York website
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.