Is Lewisboro (T), NY Tap Water Safe to Drink?
Graded D — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
46/100
waterverge.com Lewisboro (T), NY — Water Quality Report
Lewisboro (T)'s drinking water received a grade of D (46 out of 100), indicating poor water quality. The city's 15 water systems serve approximately 5,056 residents using groundwater.
Lead levels were measured at 1.4 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 408 violations on record, including 24 health-based violations. 41 remain unresolved.
What to know about Lewisboro (T)'s water
Lewisboro (T) ranks #821 out of 855 cities in New York for water quality, placing it among the lowest-rated in the state.
Lewisboro (T) relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
The system has seen 29 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Lewisboro (T), NY water safe to drink?
Lewisboro (T)'s drinking water has significant quality concerns based on EPA testing data. With a grade of D (46/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 15 water systems serve approximately 5,056 residents using groundwater (wells).
Recent water quality updates for Lewisboro (T)
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Lewisboro (T)'s water quality assessment. Grade: D (46/100).
Contaminants: Total Haloacetic Acids (HAA5), TTHM.
1 health-based. Contaminants: Groundwater Rule.
1 health-based. Contaminants: Lead and Copper Rule.
Federal disaster declaration (FEMA DR-4615). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-3572). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Lewisboro (T)'s water supply.
Well within EPA limits.
Exceeds EPA action level. Copper can leach from household plumbing — flush taps for 30 seconds before drinking.
Violation history
Lewisboro (T)'s water system has 408 total violations on record, including 24 health-based violations. 41 remain unresolved. 29 violations were issued in the last 5 years.
Flood & environmental risk
Dutchess County has experienced 10 federally declared disasters since 1971. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies. Local water sources include Wappinger Creek.
Where does Lewisboro (T)'s water come from?
Lewisboro (T)'s drinking water comes from groundwater (wells), supplied by 15 water systems serving approximately 5,056 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Wappinger Creek (river).
What Lewisboro (T) residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Lewisboro (T)'s water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Lewisboro (T)'s area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Drought conditions
D1 — moderate droughtWestchester County is currently in D1 (moderate drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Flood & disaster history
Dutchess County has experienced 10 federally declared disasters since 1971. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Lewisboro (T)'s water supply, we recommend the following filter types.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 1.4 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 1.41 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level trend (90th percentile)
See how Lewisboro (T) compares by contaminant
Explore where Lewisboro (T) ranks among all New York cities for specific contaminants.
Water source & infrastructure
Where Lewisboro (T)'s water comes from
Lewisboro (T)'s drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by local government ownership and serves approximately 5,056 people through 15 water systems.
Water bodies near Lewisboro (T)
Lewisboro (T) is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Lewisboro (T)
| System Name | PWSID | Population | Source |
|---|---|---|---|
| OAKRIDGE WATER DISTRICT | NY5918395 | 892 | GW |
| WILD OAKS WATER COMPANY | NY5903479 | 805 | GU |
| MEADOWS AT CROSS RIVER | NY5920685 | 630 | GU |
| TRUESDALE CORPORATION | NY5903468 | 400 | GW |
| TWIN LAKES WATER CO., INC. | NY5903475 | 366 | GW |
| LAKE KATONAH CLUB INC | NY5903476 | 356 | GW |
| MICHELLE ESTATES | NY5930013 | 340 | GW |
| INDIAN HILL SUBDIVISION | NY5918382 | 320 | GW |
| GOLDENS BRIDGE COMMUNITY ASSOC | NY5903428 | 250 | GW |
| ARBOR HILLS WATER WORKS | NY5922910 | 180 | GW |
| LEWISBORO COMMONS | NY5930083 | 168 | GU |
| HUNT FARM WATER COMPANY | NY5920064 | 156 | GW |
| KEELER FIELD | NY5906656 | 100 | GW |
| FOREST PARK WATER CO PLANT #3 | NY5903487 | 67 | GW |
| WACCABUC FARMS INC. | NY5903769 | 26 | GW |
How Lewisboro (T) compares
Full New York rankings →Lewisboro (T)'s score of 46/100 is below the average of 74/100 among major New York cities. 10 of 10 nearby cities score higher.
Nearby cities
View New York rankings →About Lewisboro (T), NY
Wikipedia →LaGrange is a town in Dutchess County, New York, United States. The population was 15,975 at the 2020 census. The town was named after the estate of the Marquis de Lafayette.
Learn more about your water
Guides and resources related to Lewisboro (T)'s water quality findings.
Explore water quality across Westchester
Frequently asked questions
Is Lewisboro (T), NY tap water safe to drink?
Lewisboro (T)'s water quality earned a grade of D (46/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #821 out of 855 cities tested in New York.
What contaminants are in Lewisboro (T)'s water?
Lead was measured at 1.4 ppb (90th percentile). 408 violations are on record.
How is Lewisboro (T)'s water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Lewisboro (T)?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Lewisboro (T)'s water come from?
Lewisboro (T)'s water is sourced from Groundwater. The city has 15 water systems serving approximately 5,056 residents.
What health violations has Lewisboro (T)'s water system had?
Lewisboro (T) has 24 health-based violations on record. The most recent violation was recorded in October 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 41 violations remain unresolved.
Is Lewisboro (T)'s groundwater at risk of contamination?
Lewisboro (T) uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 408 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Lewisboro (T)'s water compare to other cities?
Lewisboro (T) ranks #821 out of 855 cities in New York (better than 4% of state cities) and #13957 out of 15744 cities nationally (11th percentile). The grade of D reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.