PlainWater
Counties → Washington

Yakima County, Washington

Water Systems
220
Population Served
268,022
Total Violations
12,104
650 health-based
PFAS Detected
11
of 13 tested

Violation Analysis

86.4%
Systems with Violations
55.0
Avg Violations per System
5.4%
Health-Based Violations

Water Source Types

GW
49 systems (22%)
SW
1 system (0%)

PFAS Contamination

13
Systems Tested
11
PFAS Detected
84.6%
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

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

No violations on record (3) One or more violations (47)

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
Yakima Water Division City Of 112,858 57 Clean
Nob Hill Water Association 36,026 29 Clean
Sunnyside City Of 17,037 45 Clean
Selah City Of 12,515 243 Clean
Grandview City Of 11,010 346 Clean
Toppenish Water Department 8,950 8 Clean
Yak Co - Terrace Heights 8,410 174 Clean
Union Gap Water 6,433 26 Clean
Moxee Water Department 5,599 89 Clean
Wapato Waterworks 5,255 146 Clean
Granger Water Department 3,993 14 Clean
Zillah City Of 3,518 55 -
Naches Town Of 3,512 517 Clean
Mabton City Of 2,150 172 -
Tieton Water Dept City Of 1,475 66 -
Harrah Water System 1,304 27 -
Harrison Well #2 1,200 52 -
Washington Beef LLC 1,025 0 -
Allan Bros Warehouse 1,000 125 -
Wiley City Fairgrounds 1,000 0 -
Selah Cr Sb Rest Area 1,000 20 -
Yak Co - Buena Water System 952 5 -
Highland Quick Stop 801 15 -
Heritage University Water System 750 56 -
Memorial Bible Church 736 23 -
Selah Cr Nb Rest Area 685 12 -
Outlook Elementary School 600 232 -
Highland High School 500 21 -
Pomona View Mobile Park 470 34 -
Marcus Whitman School 370 13 -
Sun Tides Vista Homeowners Assn 350 6 -
Skyline Mobile Home Park 340 19 -
McDonald Well 307 5 -
Sunnyview Park 300 8 -
Selah Hills Homeowners Cooperative 300 19 -
Outlook Community Water 282 111 -
Marys Garden 280 16 -
Yakima Training Center - Pomona 280 65 -
Mountainview Elementary School 220 59 -
Panorama Place Water Assn 220 80 -
Sundquist Sunnyslope Domestic 196 3 -
Yak Co - Crewport 192 114 -
Sundquist TWH-Terrace Heights 192 3 -
Richardson Water Company 188 43 -
Bonair Winery 181 0 -
Country Mobile Estates 180 40 -
Lombard Loop Water Association 180 202 -
Cowiche Growers Inc 177 145 -
Willow Tree Park 176 94 -
Borton & Sons Inc 159 39 -

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 Yakima County? ▼
Yakima County has 12,104 total drinking water violations across 220 water systems, of which 650 are health-based violations. 86.4% of systems have at least one violation.
How many people get water from Yakima County systems? ▼
Water systems in Yakima County serve approximately 268,022 people through 220 public water systems.
Has PFAS been detected in Yakima County water? ▼
Of 13 water systems tested for PFAS in Yakima County, 11 had PFAS detected (84.6% detection rate).
What types of water sources supply Yakima County? ▼
Water systems in Yakima County use GW (49 systems), SW (1 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. 5.4% of Yakima 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.