01The verdict: is Colchester (T) water safe?
Colchester (T)'s drinking water has significant quality concerns based on EPA testing data. With a grade of F (42.5/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 3 water systems serve approximately 617 residents using groundwater (wells).
Copper is over its legal limit
Measured at 2.08 mg/L against the EPA Action Level of 1.3 mg/L. The ledger below shows how far over — and which filter removes it.
See the measurement ↓Lead is well under the limit
90th-percentile lead is 3.3 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓62 violations in the last five years
Recent compliance history is the best predictor of future problems — the year-by-year record is below.
See the record ↓Colchester (T)'s drinking water received a grade of F (42.5 out of 100), indicating failing water quality. The city's 3 water systems serve approximately 617 residents using ground water under influence.
Lead levels were measured at 3.3 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 267 violations on record, including 5 health-based violations. 25 remain unresolved.
Colchester (T) ranks #802 out of 810 cities in New York for water quality, placing it among the lowest-rated in the state. Colchester (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. As a small community water system, Colchester (T) may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities. The system has seen 62 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
02What's in Colchester (T)'s water
Every contaminant flagged in Colchester (T), on one shared scale: distance to its own legal limit. The red line is the limit — anything past it is out of compliance, and the closer a bar gets, the less headroom the system has.
Over Limit — EPA Action Level: 1.3 mg/L
Exceeds the EPA action level. Copper leaches from household plumbing — flush taps for 30 seconds before drinking, and consider a certified filter.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. | 3.3 | 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. | 2.08 | 1.3 | mg/L | Inorganic | Over Limit |
Cities ranked by 90th-percentile lead PF PFAS in New York
Cities ranked by compounds detected Cu Copper in New York
Cities ranked by 90th-percentile copper
03Colchester (T)'s ten-year track record
Each box is one year. A green check means no EPA violations; a numbered badge counts that year's violations — red if any were health-based, amber if they were monitoring or paperwork issues. The system has 267 violations on record, including 5 health-based violations. 25 remain unresolved.
1 of the last ten years was clean. The numbered years had EPA violations — red when any were health-based, amber when they were paperwork or missed-testing issues.
▼ Down 13 ppb since 1993. Latest reading: 3.3 ppb (2025) — 22% of the action level. Sampled at higher-risk homes (90th percentile).
▼ Down 2.6 mg/L since 2001. The latest reading (2.1 mg/L, 2024) is over the action level. Sampled at higher-risk homes (90th percentile).
04Where Colchester (T)'s water comes from
Colchester (T)'s drinking water is drawn from underground aquifers through wells.
Ground Water Under Influence
Underground aquifers reached by wells — naturally filtered, but can carry minerals like arsenic and nitrate.
Local treatment
Groundwater generally needs less treatment — typically disinfection and, where needed, mineral removal.
3 systems
3 water systems, operated under local government ownership.
617 people
Residents served across Colchester (T)'s service area.
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 617 people through 3 water systems.
| System name | PWSID | Population | Source |
|---|---|---|---|
| DOWNSVILLE WATER DISTRICT | NY1200258 | 617 | Ground Water Under Influence |
| COOKS FALLS WATER DISTRICT | NY1200253 | 150 | Groundwater |
| CORBETT COMMUNITY CORP. | NY1200254 | 93 | Groundwater |
Water bodies near Colchester (T)
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05Pressure on Colchester (T)'s watershed
Outside forces that shape what reaches the treatment plant. None of these is a verdict on the tap by itself — but each adds pressure worth knowing about.
Flood & storm history
10 federal disaster declarations on record for Delaware County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
06How Colchester (T) compares
Scores for nearby New York cities on one line, with the average marked.
dashed line = New York average (78/100)
Colchester (T) scores 42.5/100 — below the New York average of 78/100. Full New York rankings →
89 / 100CBrookhaven (T), NY
60.9 / 100AEast Hampton (T), NY
85.1 / 100BIslip (T), NY
71.8 / 100BSmithtown (T), NY
84.8 / 100BSouthampton (T), NY
78.8 / 100
Compare all cities in the county — grades, violations, and contaminant data side by side.→
07What to do at home
Steps matched to what testing actually found in Colchester (T)'s water — not generic advice.
Filter drinking & cooking water
NSF-certified water filter. Copper exceeds the EPA action level of 1.3 mg/L
Compare tested filters →Flush taps & check your service line
Lead leaches from pipes as water sits. Run cold water 30 seconds before drinking (especially mornings), and ask the utility whether your address still has a lead service line.
Lead risks explained →Watch for Colchester (T) alerts
This area has a history of flood declarations — after severe weather, watch for boil-water advisories from the utility, and check the live alerts on this page.
All water alerts →Frequently asked questions
Is Colchester (T), NY tap water safe to drink?
Colchester (T)'s water quality earned a grade of F (42.5/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #802 out of 810 cities tested in New York.
What contaminants are in Colchester (T)'s water?
Lead was measured at 3.3 ppb (90th percentile). 267 violations are on record.
How is Colchester (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 Colchester (T)?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Colchester (T)'s water come from?
Colchester (T)'s water is sourced from Ground water under influence. The city has 3 water systems serving approximately 617 residents.
What health violations has Colchester (T)'s water system had?
Colchester (T) has 5 health-based violations on record. The most recent violation was recorded in December 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 25 violations remain unresolved.
Is Colchester (T)'s groundwater at risk of contamination?
Colchester (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 267 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 Colchester (T)'s water compare to other cities?
Colchester (T) ranks #802 out of 810 cities in New York (better than 1% of state cities) and #14489 out of 15382 cities nationally (6th percentile). The grade of F reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.