Total Trihalomethanes (TTHMs) in Delaware Drinking Water
54 public water systems in Delaware have historical EPA violation records associated with total trihalomethanes (tthms) in the Q2 2026 snapshot.
80
Historical Records in Delaware
54
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
Delaware Systems With the Most Total Trihalomethanes (TTHMs) Records
METLAKATLA
1,575 served8 historical records
F
MAKAH NEAH BAY
1,300 served4 historical records
D
BIA NORTH IDAHO
490 served2 historical records
C
PASCHAL SHERMAN INDIAN SCHOOL
220 served2 historical records
A
TAHOLAH
1,600 served2 historical records
A
QUEETS
200 served2 historical records
A
CUYAMACA
375 served2 historical records
A
NISQUALLY-LESCHI & WEST NISQUALLY
3,200 served2 historical records
A
SANTIAGO WATER ASSOCIATION
95 served2 historical records
A
CHEHALIS TRIBAL HOUSING
620 served2 historical records
A
CTUIR PWD MISSION
1,310 served2 historical records
C
HOH TRIBE
120 served2 historical records
B
PLUMMER TRIBAL COMMUNITY
515 served2 historical records
A
WOLF POINT
125 served2 historical records
A
SIMNASHO SCHOOLIE
350 served1 historical record
A
WARM SPRINGS WATER TREATMENT PLANT
3,800 served1 historical record
B
SKOKOMISH
1,150 served1 historical record
A
SHOALWATER BAY
898 served1 historical record
A
PORT SUSAN CAMP CLUB #2
1,000 served1 historical record
A
PORT SUSAN CAMP CLUB #1
1,500 served1 historical record
A
These counts describe historical compliance records, not present concentrations or household test results. Confirm current conditions with the utility's latest Consumer Confidence Report.