Total Trihalomethanes (TTHMs) in Connecticut Drinking Water
206 public water systems in Connecticut have historical EPA violation records associated with total trihalomethanes (tthms) in the Q2 2026 snapshot.
569
Historical Records in Connecticut
206
Systems With Records
About Total Trihalomethanes (TTHMs)
- EPA Limit
- 80 ppb
- Category
- Disinfection Byproducts
- Health Effects
- Liver, kidney, nervous system problems; increased cancer risk
- Common Treatment Approaches
- Activated carbon filters
Connecticut Systems With the Most Total Trihalomethanes (TTHMs) Records
Santa Rosa Rancheria
1,000 served35 historical records
C
Avi Casino
3,001 served17 historical records
F
Las Vegas Paiute Colony
100 served16 historical records
D
Tule River Reservation Main
2,560 served11 historical records
F
Havasu Water Company
361 served11 historical records
F
Big River Development
3,550 served10 historical records
D
Six Mile and Steamboat Village
88 served8 historical records
C
Colorado River Regional Water System
3,476 served8 historical records
C
WMATUA Miner Flat
15,570 served8 historical records
F
Hopi High School - BIA
1,005 served7 historical records
F
Cocopah Bend RV & Golf Resort
1,095 served7 historical records
C
SCUA Cutter
574 served7 historical records
C
Polacca
3,890 served6 historical records
F
Redding Rancheria
2,015 served6 historical records
D
Grindstone Rancheria
150 served6 historical records
F
Havasupai Village
885 served6 historical records
D
Walker River Paiute Tribe
662 served6 historical records
D
Upper Moenkopi
1,740 served5 historical records
C
Tonto Apache
2,580 served5 historical records
C
Indian Village
35 served5 historical records
D
These counts describe historical compliance records, not present concentrations or household test results. Confirm current conditions with the utility's latest Consumer Confidence Report.