Water Quality: Friday Harbor, WA
18 water systems • 6,649 people served
Multiple Health ViolationsWater Quality Summary
Friday Harbor is served by 18 public water systems with a combined service population of 6,649 people, and has 360 EPA Safe Drinking Water Act violations on record. Critically, 66 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Friday Harbor's violation count is 122% above the national average for Washington. Contaminants associated with violations include Fecal Coliform, TTHM, Total Haloacetic Acids (HAA5).
Contaminants Found
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)
Total trihalomethanes are linked to increased risk of bladder cancer and adverse reproductive outcomes.
Common source: Reaction of chlorine disinfectants with naturally occurring organic matter in water
EPA limit: 0.080 mg/L (80 ppb)
Haloacetic acids are associated with increased cancer risk and potential reproductive and developmental effects.
Common source: Reaction of chlorine disinfectants with organic matter in treated water
EPA limit: 0.060 mg/L (60 ppb)
Water Systems Serving Friday Harbor
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| FRIDAY HARBOR TOWN OF | WA5326595 | Surface Water | 3,543 | 15 |
| ROCHE HARBOR WATER SYSTEM INC | WA5373230 | Surface Water | 1,985 | 7 |
| CAPE SAN JUAN WATER DISTRICT | WA5311065 | Groundwater | 158 | 40 |
| OAKS THE MOBILE HOME PARK | WA5387780 | Groundwater | 143 | 2 |
| PORTLAND FAIR ESTATES | WA5369008 | Groundwater | 130 | 26 |
| LIMESTONE POINT WATER COMPANY INC | WA5347280 | Groundwater | 81 | 123 |
| MITCHELL POINT WATER ASSN | WA5355370 | Surface Water | 81 | 6 |
| UNIVERSITY HEIGHTS | WA5390543 | Groundwater | 76 | 4 |
| HANNAH HEIGHTS OWNERS ASSOCIATION | WA5330850 | Groundwater | 66 | 3 |
| EAGLE COVE WATER ASSOCIATION | WA5320803 | Groundwater | 65 | 4 |
| CATTLE POINT WATER DISTRICT | WA5342751 | Surface Water | 63 | 11 |
| MINERAL HEIGHTS ASSOCIATION | WA5355035 | Groundwater | 46 | 8 |
| HANNAH HEIGHTS #2 WATER USERS ASSN | WA5325264 | Groundwater | 44 | 59 |
| SAN JUAN FAIRWAYS OWNERS ASSN | WA5375765 | Groundwater | 40 | 4 |
| FAIRWAY NUMBER THREE WATER | WA5324528 | Groundwater | 39 | 35 |
| SAN JUAN RANCHOS | WA5375795 | Groundwater | 35 | 2 |
| SMUGGLERS COVE WATER SYSTEM | WA5301666 | Groundwater | 27 | 2 |
| NORTH FORTY PROPERTY OWNERS ASSN | WA5301698 | Groundwater | 27 | 9 |
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 Washington
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.