Thiells, NY Water Safety: 65/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-06-03
For most households in Thiells, NY tap water is adequate — the middle-tier grade reflects gaps in specific service areas.
How Thiells Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Thiells Residents
- Homes built before 1986: 93% — older plumbing may contain lead solder.
- Estimated remediation: $1,800 per household.
- CDC health risk index: 11.71.
Thiells's Water Providers
Federal drinking water records identify 2 systems in Thiells, NY. The leading 2 providers serve the largest share of residential connections, each operating as a separate entity with its own rate authority, infrastructure management, and EPA compliance obligations — so service conditions are not uniform city-wide.
Overview
We track water quality and home safety data for 1 ZIP code in Thiells, New York (population ~2,760), covering 2 community water systems serving approximately 270,055 people region-wide.
No EPA violations recorded across any ZIP codes in Thiells — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Thiells: C (65/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Thiells water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Thiells
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 10984 | C | VEOLIA WATER NEW YORK | 270,000 |
All ZIP Codes in Thiells
- 10984 [C]
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Thiells Community Health Snapshot
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Thiells Infrastructure Age
With 93% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Thiells's housing stock is predominantly older, with a median build year of 1975 that reflects decades of construction before federal plumbing standards were tightened. The 1986 ban on lead solder and the pre-1970 era of lead service lines are both relevant benchmarks here — a significant share of the residential inventory predates one or both of those cutoffs, creating an elevated baseline for plumbing-related lead risk that aggregate water quality data may not fully reflect at the household level.
Over half of homes in Thiells were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
How Remediation Costs Compare in Thiells
Remediation costs in Thiells are small relative to typical property values — the cost-to-value ratio here is favorable.
Remediation costs in Thiells are relatively low compared to home values. The $1,200–$2,600 estimated range is a small fraction of median property value. Home values are 50% above the New York average.
Thiells: Lead Risk & Vulnerable Populations
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
93% of Thiells housing dates to the pre-rule era, alongside aggregate readings hovering at the federal action mark — household-level confirmation through a draw-test kit fits the local picture.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Thiells: Flood History & Water Damage Risk
Flood activity in Thiells is neither negligible nor at the level of the highest-exposure areas in the NFIP dataset. The 12-claim record and 100% flood zone coverage suggest a community that has experienced recurrent events but has not faced the kind of sustained, severe exposure where water-supply contamination becomes a primary public health concern. It sits in a middle range where flood history merits inclusion in any complete local water quality picture.
Thiells has a moderate flood history with 12 FEMA claims averaging $2,407 per payout. 100% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$1,800</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
What You Can Do in Thiells
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. With 93% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Thiells, NY