Latah County, Idaho
12 ZIP codes · Avg score 59/100 · Grade C · Updated 2026-06-03
Safe water is the norm for most of Latah County's 12 ZIP codes — but a notable subset have documented violations that push the grade to the middle tier.
How Latah County Compares
How Latah County Compares
Latah County scores 7 points below the Idaho state average (66/100) and 9 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Latah County, Idaho
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 10.5 (asthma 10.7%, diabetes 7.8%)
Estimated additional annual cost per homeowner: $1,160, driven primarily by energy_code_gap
Infrastructure: 0.398% avg pipe failure probability, 42% of ZIPs at high risk
65% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Latah County water systems. Health-based shown in red, total in blue.
Peak year: 2022 with 4 violations. Past 5 years: 12 total (12 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: $1,160
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
17,773 housing units in Latah 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 Latah County
Remediation costs are relatively manageable for most homeowners in Latah 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 Latah 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 Latah County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Moscow Water Department | 26,000 | 17 |
| 2 | University of Idaho | 8,589 | 16 |
| 3 | North Tomer Butte W&s District | 259 | 16 |
| 4 | Apex Living Community | 150 | 16 |
| 5 | Hoo Doo Harvard Water and Sewer District | 82 | 13 |
17 total water systems serve Latah County.
All ZIP Codes in Latah County
12 ZIP codes tracked in Latah County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 83537 | Kendrick | 70 | B | 0 | $240K |
| 2 | 83855 | Potlatch | 69 | C | 4 (1 health) | $294K |
| 3 | 83832 | Genesee | 68 | C | 1 | $316K |
| 4 | 83806 | Bovill | 66 | C | 1 | $121K |
| 5 | 83823 | Deary | 66 | C | 1 | $414K |
| 6 | 83872 | Viola | 66 | C | 1 | $480K |
| 7 | 83844 | Moscow | 65 | C | 8 (1 health) | — |
| 8 | 83871 | Troy | 65 | C | 8 (1 health) | $333K |
| 9 | 83843 | Moscow | 64 | C | 8 (1 health) | $354K |
| 10 | 83857 | Princeton | 56 | C | 0 | $326K |
| 11 | 83834 | Harvard | 41 | D | 13 | $408K |
| 12 | 83535 | Juliaetta | 12 | F | 12 (8 health) | $273K |
Recommended Buyer Guides for Latah County
While many sites publish identical guide lists across every county they cover, the selection here changes by location — driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.
- Best Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- Best Lead Paint Test Kits — 65% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Latah County, Idaho
Overview
Latah County in Idaho covers 12 ZIP codes with an average Home Safety Score of C (59/100).
10 of 12 ZIP codes have recorded EPA violations. 12 health-based violations have been documented.
← Back to Idaho 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.