Is Great Valley (T), NY Tap Water Safe to Drink?
Graded A, with 2 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
91.2/100
waterverge.com Great Valley (T), NY — Water Quality Report
Great Valley (T)'s drinking water received a grade of A (91.2 out of 100), indicating excellent water quality. The city's 6 water systems serve approximately 1,025 residents using purchased ground water.
Lead levels were measured at 0.0 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 47 violations on record, including 1 health-based violation. 2 remain unresolved.
What to know about Great Valley (T)'s water
Great Valley (T) ranks #171 out of 855 cities in New York for water quality, placing it above average in the state.
Great Valley (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, Great Valley (T) may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Great Valley (T), NY water safe to drink?
Great Valley (T)'s tap water meets most EPA standards but has areas that warrant attention. With a grade of A (91.2/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 6 water systems serve approximately 1,025 residents using groundwater (wells).
Recent water quality updates for Great Valley (T)
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Great Valley (T)'s water quality assessment. Grade: A (91.2/100).
Contaminants: Revised Total Coliform Rule.
Contaminants: Consumer Confidence Rule.
Contaminants: TTHM, Total Haloacetic Acids (HAA5).
Federal disaster declaration (FEMA DR-3351). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-3262). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Great Valley (T)'s water supply.
Well within EPA limits.
Violation history
Great Valley (T)'s water system has 47 total violations on record, including 1 health-based violation. 2 remain unresolved.
Flood & environmental risk
Cattaraugus County has experienced 5 federally declared disasters since 1967. 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 Allegheny River.
Where does Great Valley (T)'s water come from?
Great Valley (T)'s drinking water comes from groundwater (wells), supplied by 6 water systems serving approximately 1,025 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Allegheny River (river).
What Great Valley (T) residents can do
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.
Great Valley (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
Flood & disaster history
Cattaraugus County has experienced 5 federally declared disasters since 1967. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
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. | 0.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Great Valley (T) compares by contaminant
Explore where Great Valley (T) ranks among all New York cities for specific contaminants.
Water source & infrastructure
Where Great Valley (T)'s water comes from
Great Valley (T) purchases its water supply from a regional wholesale provider rather than treating raw water directly.
Water quality depends on both the wholesaler's treatment standards and the condition of Great Valley (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 1,025 people through 6 water systems.
Water bodies near Great Valley (T)
Great Valley (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 Great Valley (T)
| System Name | PWSID | Population | Source |
|---|---|---|---|
| GREAT VALLEY TOWN W.D. #2 (SNO-PINE) | NY0430002 | 320 | GWP |
| GREEN VALLEY ESTATES | NY0417895 | 250 | GW |
| GREAT VALLEY TOWN W.D. #1 | NY0412218 | 230 | GWP |
| GREAT VALLEY TOWN W.D. #4 (HIGHLAND AVE. | NY0430052 | 105 | GWP |
| COUNTRY VILLAGE | NY0412074 | 75 | GW |
| GREAT VALLEY TOWN W.D. #3 (BONNE VAL) | NY0430026 | 45 | GW |
How Great Valley (T) compares
Full New York rankings →Great Valley (T)'s score of 91.2/100 is above the average of 74/100 among major New York cities. It outscores 10 of 10 nearby cities.
Nearby cities
View New York rankings →About Great Valley (T), NY
Wikipedia →Great Valley is a town in Cattaraugus County, New York, United States. The population was 1,991 at the 2020 census. The town is named after its local geographical setting, a relative comparison of two tributaries of the Allegheny River.
Learn more about your water
Guides and resources related to Great Valley (T)'s water quality findings.
Explore water quality across Cattaraugus
Frequently asked questions
Is Great Valley (T), NY tap water safe to drink?
Great Valley (T)'s water quality earned a grade of A (91.2/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #171 out of 855 cities tested in New York.
What contaminants are in Great Valley (T)'s water?
Lead was measured at 0.0 ppb (90th percentile). 47 violations are on record.
How is Great Valley (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 Great Valley (T)?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Great Valley (T)'s water come from?
Great Valley (T)'s water is sourced from Purchased ground water. The city has 6 water systems serving approximately 1,025 residents.
What health violations has Great Valley (T)'s water system had?
Great Valley (T) has 1 health-based violation on record. The most recent violation was recorded in October 2020. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 2 violations remain unresolved.
Is Great Valley (T)'s groundwater at risk of contamination?
Great Valley (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 47 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 Great Valley (T)'s water compare to other cities?
Great Valley (T) ranks #171 out of 855 cities in New York (better than 80% of state cities) and #1832 out of 15744 cities nationally (88th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.