Water Quality: Coeur D'Alene, ID
18 water systems • 5,213 people served
Multiple Health ViolationsWater Quality Summary
Coeur D'Alene is served by 18 public water systems with a combined service population of 5,213 people, and has 155 EPA Safe Drinking Water Act violations on record. Critically, 29 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Coeur D'Alene's violation count is 16% above the national average for Idaho. Contaminants associated with violations include Chlorine Dioxide, Disinfection Byproducts, E. coli, Fecal Coliform, Gross Alpha.
Contaminants Found
Can cause anemia in infants and young children; may cause nervous system effects at high levels.
Common source: Water treatment disinfectant used to control taste, odor, and microorganisms
EPA limit: 0.8 mg/L
Broad category of chemicals formed during disinfection, associated with increased cancer risk and adverse reproductive effects.
Common source: Reaction of disinfectants (chlorine, ozone, chloramines) with organic matter
Causes gastrointestinal illness; certain strains (e.g., O157:H7) can cause severe kidney failure and death.
Common source: Fecal contamination from humans or animals entering the water supply
EPA limit: Zero (no E. coli permitted in drinking water)
Indicates direct fecal contamination; associated with diarrhea, cramps, nausea, and potential severe illness.
Common source: Human and animal fecal waste
EPA limit: Zero tolerance (any positive triggers violations)
Alpha-emitting radioactive particles increase cancer risk, particularly from bone and other internal cancers.
Common source: Natural uranium and radium in geological formations
EPA limit: 15 pCi/L (excluding radon and uranium)
Water Systems Serving Coeur D'Alene
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| KOOTENAI COUNTY WATER DIST 1 | ID1280106 | Surface Water | 843 | 40 |
| GEM STATE - SPIRIT LAKE EAST | ID1280176 | Groundwater | 843 | 11 |
| SAGLE VALLEY WATER DIST | ID1090118 | Groundwater | 708 | 3 |
| GEM STATE - BAR CIRCLE S RANCH | ID1280010 | Groundwater | 633 | 2 |
| GEM STATE - BITTERROOT WATER COMPANY | ID1280260 | Groundwater | 428 | 7 |
| TROY HOFFMAN WATER CORP | ID1280096 | Groundwater | 367 | 2 |
| ARROW POINT PARK | ID1280252 | Surface Water | 275 | 4 |
| CARLIN BAY PROPERTY OWNERS ASSOCIATION | ID1280039 | Surface Water | 220 | 4 |
| COUGAR BAY WATER ASSOCIATION | ID1280309 | Groundwater | 200 | 1 |
| GEM STATE - DIAMOND BAR ESTATES | ID1280268 | Groundwater | 143 | 3 |
| MOUNTAIN VIEW PARK | ID1280124 | Groundwater | 97 | 2 |
| THIRD ADDITION WATER ASSN | ID1280165 | Groundwater | 97 | 0 |
| RAMSEY ESTATES | ID1280285 | Groundwater | 88 | 31 |
| HUETTER CITY OF | ID1280100 | Groundwater | 70 | 13 |
| PINE HAVEN PARK | ID1280139 | Groundwater | 66 | 22 |
| GEM STATE - HAPPY VALLEY WATER SYSTEM | ID1280220 | Groundwater | 60 | 8 |
| PANHANDLE MOBILE HOME PARK | ID1280131 | Groundwater | 50 | 1 |
| LAKELAND MEADOWS | ID1280343 | Groundwater | 25 | 1 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in Idaho
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.