Cyanide in Colorado Drinking Water
17 public water systems in Colorado have historical EPA violation records associated with cyanide in the Q2 2026 snapshot.
28
Historical Records in Colorado
17
Systems With Records
About Cyanide
- EPA Limit
- 200 ppb
- Category
- Inorganic
- Health Effects
- Nerve damage, thyroid problems
- Common Treatment Approaches
- Reverse osmosis, ion exchange
Colorado Systems With the Most Cyanide Records
DAKOTA MAGIC CASINO
2,360 served5 historical records
D
LAME DEER WATER SYSTEM
2,605 served4 historical records
C
URIAH HEEPS SPRING WATER SYSTEM
3,750 served3 historical records
D
ETHETE WATER SYSTEM
1,950 served2 historical records
C
ARAPAHOE COMM WATER SYSTEM
4,100 served2 historical records
B
CROW CREEK SIOUX TRIBE WATER SYSTEM
130 served1 historical record
B
ROSEBUD RURAL WATER SYSTEM
5,500 served1 historical record
B
ST. FRANCIS
2,450 served1 historical record
B
ARAPAHOE INDUSTRIAL PARK
650 served1 historical record
B
HOT SPRINGS COURT
55 served1 historical record
D
PRYOR WATER SYSTEM
406 served1 historical record
C
AMERICAN HORSE SCHOOL
400 served1 historical record
B
LOWER BRULE RURAL WATER SUPPLY SYSTEM
1,637 served1 historical record
C
WHITE MESA WATER SYSTEM
300 served1 historical record
C
ROCKY BOY'S RURAL WATER
2,000 served1 historical record
C
WHITEROCKS WATER SYSTEM
812 served1 historical record
B
FORT WASHAKIE
2,620 served1 historical record
B
These counts describe historical compliance records, not present concentrations or household test results. Confirm current conditions with the utility's latest Consumer Confidence Report.