Adams County, Washington
6 ZIP codes · Avg score 69/100 · Grade C · Updated 2026-06-03
In recent monitoring cycles, Adams County's 6 ZIP codes show a split record — several have documented water safety violations.
How Adams County Compares
How Adams County Compares
Adams County scores 9 points below the Washington state average (78/100) and 1 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Adams County, Washington
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.2 (asthma 10.8%, diabetes 12.8%)
Estimated additional annual cost per homeowner: $1,247, driven primarily by energy_code_gap
Infrastructure: 0.438% avg pipe failure probability, 83% of ZIPs at high risk
79.8% of homes built before 1978 (lead paint era)
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: $1,247
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
7,700 housing units in Adams 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 Adams County
Remediation costs are relatively manageable for most homeowners in Adams 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 Adams 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 Adams County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Othello Water Department | 8,755 | 11 |
| 2 | Adams County Water District #1 | 870 | 11 |
| 3 | Royal Water District | 430 | 11 |
| 4 | Ringold Domestic Water Corporation | 340 | 11 |
| 5 | West Mesa Domestic Water Assn | 316 | 11 |
11 total water systems serve Adams County.
All ZIP Codes in Adams County
6 ZIP codes tracked in Adams County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 99341 | Lind | 82 | B | 1 | $245K |
| 2 | 99169 | Ritzville | 81 | B | 4 | $211K |
| 3 | 99371 | Washtucna | 75 | B | 7 | $188K |
| 4 | 99344 | Othello | 72 | B | 11 | $257K |
| 5 | 99144 | Lamona | 53 | D | 0 | — |
| 6 | 99154 | Mohler | 53 | D | 0 | $158K |
Recommended Buyer Guides for Adams County
Editorial-only picks, screened against the EPA detections on file.
- Best Lead Paint Test Kits — 79.8% of homes built before 1978
Deep Dive Reports
Detailed analysis for Adams County, Washington
Overview
Adams County in Washington covers 6 ZIP codes with an average Home Safety Score of C (69/100).
4 of 6 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← 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.