01The verdict: is Seneca (T) water safe?
Seneca (T)'s drinking water has significant quality concerns based on EPA testing data. With a grade of B+ (80.5/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 2,625 residents using groundwater (wells).
Copper is over its legal limit
Measured at 1.40 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 3.4 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓A flood-prone service area
5 federal disaster declarations on record. After severe weather, watch for boil-water advisories.
See the risk factors ↓Seneca (T)'s drinking water received a grade of B+ (80.5 out of 100), indicating good water quality. The city's 1 water system serves approximately 2,625 residents using purchased ground water.
Lead levels were measured at 3.4 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 4 violations on record, including 0 health-based violations. 3 remain unresolved.
Seneca (T) ranks #553 out of 810 cities in New York for water quality, placing it below average in the state. Seneca (T) purchases its water from a regional wholesaler, meaning quality depends on both the supplier's treatment and the local distribution system's condition. As a small community water system, Seneca (T) may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
02What's in Seneca (T)'s water
Every contaminant flagged in Seneca (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. | 3.4 | 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. | 1.40 | 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
03Seneca (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 4 violations on record, including 0 health-based violations. 3 remain unresolved.
All ten of the last ten years were clean — no EPA violations recorded for Seneca (T).
▼ Down 1.3 ppb since 2003. Latest reading: 2.1 ppb (2024) — 14% of the action level. Sampled at higher-risk homes (90th percentile).
1.4mg/L(2006)
One sampling round on record — 108% of the 1.3mg/L EPA action level. Sampled at higher-risk homes (90th percentile).
04Where Seneca (T)'s water comes from
Seneca (T) purchases its water supply from a regional wholesale provider rather than treating raw water directly.
Purchased Groundwater
Water is bought from a regional wholesaler; quality starts at the supplier's intake and treatment.
Wholesale supplier
Primary treatment happens at the wholesaler; the local utility maintains disinfectant residual in its pipes.
1 system
1 water system, operated under local government ownership.
2,625 people
Residents served across Seneca (T)'s service area.
Water quality depends on both the wholesaler's treatment standards and the condition of Seneca (T)'s local distribution pipes and storage facilities. Purchased water systems are common in suburban areas and smaller communities that lack the infrastructure for independent treatment. The system is operated by local government ownership and serves approximately 2,625 people through 1 water system.
| System name | PWSID | Population | Source |
|---|---|---|---|
| SENECA TOWN WD | NY3401178 | 2,625 | Purchased Groundwater |
Water bodies near Seneca (T)
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05Pressure on Seneca (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
5 federal disaster declarations on record for Ontario County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
06How Seneca (T) compares
Scores for nearby New York cities on one line, with the average marked.
dashed line = New York average (78/100)
Seneca (T) scores 80.5/100 — on par with the New York average of 78/100. It outscores 6 of 10 nearby cities. 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 Seneca (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 Seneca (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 Seneca (T), NY tap water safe to drink?
Seneca (T)'s water quality earned a grade of B+ (80.5/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #553 out of 810 cities tested in New York.
What contaminants are in Seneca (T)'s water?
Lead was measured at 3.4 ppb (90th percentile). 4 violations are on record.
How is Seneca (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 Seneca (T)?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Seneca (T)'s water come from?
Seneca (T)'s water is sourced from Purchased ground water. The city has 1 water system serving approximately 2,625 residents.
Is Seneca (T)'s groundwater at risk of contamination?
Seneca (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 4 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 Seneca (T)'s water compare to other cities?
Seneca (T) ranks #553 out of 810 cities in New York (better than 32% of state cities) and #7745 out of 15382 cities nationally (50th percentile). The grade of B+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Seneca (T)'s small water system affect quality?
Seneca (T)'s system serves approximately 2,625 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 4 violations on record.