PlainWater
Counties → Washington

Thurston County, Washington

Water Systems
322
Population Served
395,780
Total Violations
24,330
929 health-based
PFAS Detected
3
of 7 tested

Violation Analysis

95.0%
Systems with Violations
75.6
Avg Violations per System
3.8%
Health-Based Violations

Water Source Types

GW
50 systems (16%)

PFAS Contamination

7
Systems Tested
3
PFAS Detected
42.9%
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

Thurston 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
Olympia City Of 113,584 41 Detected
Lacey Water Department 103,755 61 Detected
Tumwater City Of 66,373 22 Detected
Yelm City Of 16,633 9 Clean
Tanglewilde Thompson Place 600 7,900 2 Clean
Pattison 500 4,302 67 Clean
Grand Mound 3,764 4 -
Millersylvania State Park 3,456 4 -
Tenino City of 3,336 118 Clean
Maytown Rest Area 3,134 17 -
Meadows 690 3,100 23 -
Clearwood 2,956 10 -
Rainier Water Department 2,758 90 -
Nisqually Pines Community Club 2,037 4 -
Scatter Creek Rest Area 1,858 19 -
Rochester 1,762 39 -
Scott Lake 1,604 8 -
Evergreen Shores 1,329 11 -
Rochester High School 1,275 42 -
Carlyon Beach Homeowners 1,273 29 -
Boston Harbor 1,153 62 -
Schilter Family Farm Store 1,056 2 -
Holiday Ranchettes 1,050 13 -
Nisqually Commercial Park 940 166 -
Sunwood Lakes Homeowners Assoc Inc 925 49 -
Lake Lawrence 914 18 -
Scenic Shores Water Company 761 24 -
Tolmie State Park 683 22 -
Griffin School 672 48 -
South Sound Speedway 654 33 -
Cedar Creek Corrections Center 639 26 -
South Bay Elementary School 615 239 -
East Olympia Elementary School 593 21 -
Bucoda Water Dept 579 30 -
Southworth Elementary 550 1,658 -
Foxhall 549 4 -
Zebras Aqueous Substance 526 102 -
Rolling Firs Evergreen Terrace 514 18 -
Silver Hawk 499 0 -
Countrywood Estates 680 488 27 -
Classic Heights 480 155 -
Black Lake Bible Camp & Conf Ctr 477 134 -
Spar Restaurant 474 26 -
Littlerock Elementary 463 33 -
Maple Lane Behavioral Health 450 56 -
Villa Grove 442 51 -
Hawley Hills 686 425 14 -
Henderson Boulevard 418 19 -
Delphi 381 27 -
Alpine Hills 363 11 -

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
Kitsap County
221 systems · 331,366 served · 12,667 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Thurston County? ▼
Thurston County has 24,330 total drinking water violations across 322 water systems, of which 929 are health-based violations. 95.0% of systems have at least one violation.
How many people get water from Thurston County systems? ▼
Water systems in Thurston County serve approximately 395,780 people through 322 public water systems.
Has PFAS been detected in Thurston County water? ▼
Of 7 water systems tested for PFAS in Thurston County, 3 had PFAS detected (42.9% detection rate).
What types of water sources supply Thurston County? ▼
Water systems in Thurston County use GW (50 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. 3.8% of Thurston 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.