PlainWater
Counties → Washington

San Juan County, Washington

Water Systems
112
Population Served
39,901
Total Violations
6,963
604 health-based
PFAS Detected
0
of 2 tested

Violation Analysis

92.0%
Systems with Violations
62.2
Avg Violations per System
8.7%
Health-Based Violations

Water Source Types

GW
32 systems (29%)
SW
18 systems (16%)

PFAS Contamination

2
Systems Tested
0
PFAS Detected
0.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

San Juan Washington water systems by violation status, EPA SDWIS records.

No violations on record (0) One or more violations (50)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Moran State Park-Mountain Lake 4,804 10 -
Moran State Park - Summit Lake 4,803 2 -
Moran State Park-Cascade Lake 4,783 19 -
Eastsound Water Users Association 3,711 304 Clean
Friday Harbor Town Of 3,543 56 Clean
Limekiln State Park 2,149 14 -
Roche Harbor Water System Inc 1,985 1,788 -
Fisherman Bay Water Association 1,195 35 -
Rosario 1,031 54 -
Orcas Landing Inc 1,007 770 -
Sucia Island State Park 794 12 -
Sucia Island St Park-Shallow Bay 757 10 -
Spencer Spit State Park 655 11 -
Jones Island State Park 509 29 -
Stuart Is State Park 486 17 -
Doe Bay Water Users Assoc 442 66 -
Lopez School District #144 402 9 -
Olga Water Users Inc 392 37 -
Blakely Is. Maintenance Commission 333 72 -
Camp Nor Wester 281 3 -
Orcas Highlands 260 14 -
Camp Orkila 233 8 -
English Camp 233 4 -
West Sound Water Association 206 65 -
Worldmark Resort at Deer Harbor 190 8 -
American Camp 186 4 -
Odlin Park 162 25 -
Cape San Juan Water District 158 59 -
Oaks the Mobile Home Park 143 34 -
Decatur Shores Community Assoc 140 15 -
MacKaye Harbor Water District 133 11 -
Portland Fair Estates 130 47 -
Snug Harbor Resort Water System 127 42 -
San Juan Golf & Country Club 121 4 -
North Lopez Service 114 48 -
San Juan Co Park 114 3 -
Duck Soup Inn 96 22 -
Center Island Water System 93 15 -
Spring Point Homeowners Association 85 590 -
Harbor on Fisherman Bay 84 32 -
Canoe Island 82 20 -
Limestone Point Water Company Inc 81 86 -
Mitchell Point Water Assn 81 23 -
Raccoon Point Water System 81 623 -
Sunset Ranch Owners Assoc 76 108 -
University Heights 76 30 -
West Beach Resort 76 17 -
Southend Water System 75 28 -
Cormorant Water System 72 5 -
Hannah Heights Owners Association 66 82 -

Other Counties in Washington

King County
217 systems · 3,193,095 served · 20,636 violations
Pierce County
359 systems · 1,138,508 served · 14,826 violations
Snohomish County
170 systems · 947,238 served · 8,193 violations
Spokane County
164 systems · 621,798 served · 9,829 violations
Clark County
72 systems · 615,931 served · 9,864 violations
Thurston County
322 systems · 395,780 served · 24,330 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in San Juan County? ▼
San Juan County has 6,963 total drinking water violations across 112 water systems, of which 604 are health-based violations. 92.0% of systems have at least one violation.
How many people get water from San Juan County systems? ▼
Water systems in San Juan County serve approximately 39,901 people through 112 public water systems.
Has PFAS been detected in San Juan County water? ▼
Of 2 water systems tested for PFAS in San Juan County, 0 had PFAS detected (0.0% detection rate).
What types of water sources supply San Juan County? ▼
Water systems in San Juan County use GW (32 systems), SW (18 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 8.7% of San Juan County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.