PlainWater
Counties → Washington

Okanogan County, Washington

Water Systems
123
Population Served
44,103
Total Violations
7,257
473 health-based
PFAS Detected
1
of 1 tested

Violation Analysis

94.3%
Systems with Violations
59.0
Avg Violations per System
6.5%
Health-Based Violations

Water Source Types

GW
48 systems (39%)
SW
2 systems (2%)

PFAS Contamination

1
Systems Tested
1
PFAS Detected
100.0%
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

Okanogan Washington water systems by violation status, EPA SDWIS records.

No violations on record (1) One or more violations (49)

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
Omak City Of 4,940 13 Detected
Oroville City Of 3,256 92 -
Brewster City Of 3,235 29 -
Okanogan Water Department City Of 2,921 77 -
Tonasket Water System 2,392 25 -
Pearrygin Lake State Park - Both Cg 2,103 17 -
Okanogan Neighbors 1,600 5 -
Coulee Dam Water Dept 1,359 7 -
Winthrop Town Of 1,350 27 -
Monse-Riggan Camp 1,165 13 -
Pateros Water Department 1,149 93 -
Alta Lake State Park 1,071 11 -
Twisp Town Of 1,044 138 -
Conconully State Park 1,004 16 -
Johns Farms 872 4 -
Okanogan County Fair Water System 867 20 -
Liberty Bell High School 642 704 -
Jaw Farms Inc 636 26 -
Duck Lake Water Association 635 62 -
Brewster Flat Domestic Water Assn 542 35 -
Nespelem Water Dept 510 110 -
P and G Orchards Camp 2 489 102 -
Bridgeport State Park 441 15 -
Riverside Town Of 429 111 -
Washington Pass Well - Methow RD 413 4 -
Sun Mountain Resort 376 387 -
Elmer City Water System 368 16 -
Loup Loup Ski Area 350 8 -
Progressive Flat Water Assn 335 242 -
Conconully City Well 299 17 -
Sandflat Water Association 260 7 -
Suncrest Plat Water System 260 31 -
Conconully Sp Boat Launch 258 5 -
Coleman Butte Water Assn 250 48 -
Loomis Water Users Assn Inc 225 17 -
Riverbend RV Park 222 16 -
Los Reyes Inc 200 0 -
Alta Lake Golf Course Plat 161 751 -
Honeybear Growers 161 130 -
Emerald City Green Machine 155 7 -
Country River Farm 153 11 -
P and G Orchards Camp 3 152 7 -
River Road Mobile Home Park 150 285 -
Klipchuck Cg - Methow RD 149 7 -
Aston Estates 141 51 -
Arrowhead Ranch 140 2 -
Pasayten Peak 129 1 -
Conconully Sp Primitive Area 129 5 -
Tonasket Free Methodist Church 120 5 -
Crumbacher Estates Water System 111 72 -

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 Okanogan County? ▼
Okanogan County has 7,257 total drinking water violations across 123 water systems, of which 473 are health-based violations. 94.3% of systems have at least one violation.
How many people get water from Okanogan County systems? ▼
Water systems in Okanogan County serve approximately 44,103 people through 123 public water systems.
Has PFAS been detected in Okanogan County water? ▼
Of 1 water systems tested for PFAS in Okanogan County, 1 had PFAS detected (100.0% detection rate).
What types of water sources supply Okanogan County? ▼
Water systems in Okanogan County use GW (48 systems), SW (2 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. 6.5% of Okanogan 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.