Grays Harbor County, Washington
22 ZIP codes · Avg score 77/100 · Grade B · Updated 2026-06-03
Covering 22 ZIP codes, Grays Harbor County earns a high grade for tap water — most systems report zero health-based violations, and the overall compliance rate comfortably exceeds federal benchmarks.
How Grays Harbor County Compares
How Grays Harbor County Compares
Grays Harbor County scores 1 points below the Washington state average (78/100) and 9 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Grays Harbor County, Washington
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.5 (asthma 11.5%, diabetes 13.6%)
Estimated additional annual cost per homeowner: $2,637, driven primarily by sea_level
Infrastructure: 0.43% avg pipe failure probability, 50% of ZIPs at high risk
65.2% of homes built before 1978 (lead paint era)
Violation History (2023–2025)
→ Stable trendEPA violation counts by year across Grays Harbor County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 8 violations. Past 5 years: 17 total (17 health-based).
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $2,637
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
38,031 housing units in Grays Harbor County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Grays Harbor County
Remediation costs are relatively manageable for most homeowners in Grays Harbor County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Grays Harbor County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Grays Harbor County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | WESTPORT WATER DEPARTMENT | 5,346 | 30 |
| 2 | Grays Harbor Company Water District 2 | 5,112 | 18 |
| 3 | Greenwood Mobile Home Park | 240 | 18 |
| 4 | City of Aberdeen | 17,958 | 13 |
| 5 | Hoquiam Water Department | 11,456 | 13 |
29 total water systems serve Grays Harbor County.
All ZIP Codes in Grays Harbor County
22 ZIP codes tracked in Grays Harbor County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 98566 | Neilton | 99 | A | 1 | $128K |
| 2 | 98557 | Mccleary | 95 | A | 1 | $351K |
| 3 | 98575 | Quinault | 95 | A | 0 | $255K |
| 4 | 98583 | Satsop | 94 | A | 2 | — |
| 5 | 98535 | Copalis Beach | 90 | A | 0 | $262K |
| 6 | 98541 | Elma | 84 | B | 5 (1 health) | $338K |
| 7 | 98568 | Oakville | 82 | B | 0 | $410K |
| 8 | 98563 | Montesano | 81 | B | 6 | $315K |
| 9 | 98550 | Hoquiam | 80 | B | 1 | $212K |
| 10 | 98595 | Westport | 74 | B | 18 (4 health) | $255K |
| 11 | 98552 | Humptulips | 73 | B | 0 | — |
| 12 | 98562 | Moclips | 73 | B | 0 | — |
| 13 | 98571 | Pacific Beach | 73 | B | 0 | — |
| 14 | 98520 | Aberdeen | 71 | B | 12 | $237K |
| 15 | 98526 | Amanda Park | 66 | C | 0 | $66K |
| 16 | 98536 | Copalis Crossing | 66 | C | 0 | — |
| 17 | 98559 | Malone | 66 | C | 0 | — |
| 18 | 98560 | Matlock | 66 | C | 0 | $506K |
| 19 | 98587 | Taholah | 66 | C | 0 | $108K |
| 20 | 98537 | Cosmopolis | 65 | C | 0 | $301K |
| 21 | 98547 | Grayland | 65 | C | 0 | $193K |
| 22 | 98569 | Ocean Shores | 65 | C | 0 | $374K |
Recommended Buyer Guides for Grays Harbor County
Designed to find the guide that fits the county, not the other way around — the system reads EPA detections, FEMA hazard layers, and CDC lead-exposure markers, then outputs the categories that resolve those specific risks for households here, with NSF-certified products surfaced when the matching contaminant appears in the local monitoring data.
- Best Lead Paint Test Kits — 65.2% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Grays Harbor County, Washington
Overview
Grays Harbor County in Washington covers 22 ZIP codes with an average Home Safety Score of B (77/100).
8 of 22 ZIP codes have recorded EPA violations. 5 health-based violations have been documented.
← Back to Washington water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.