Siskiyou County, California
19 ZIP codes · Avg score 83/100 · Grade B · Updated 2026-06-03
Within Siskiyou County's 19 tracked ZIP codes, safety indicators remain above the national average with few health-based violations on record.
How Siskiyou County Compares
How Siskiyou County Compares
Siskiyou County scores 10 points above the California state average (73/100) and 15 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Siskiyou County, California
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%, diabetes 13.9%)
Estimated additional annual cost per homeowner: $2,185, driven primarily by wildfire
Infrastructure: 0.391% avg pipe failure probability, 37% of ZIPs at high risk
71.4% 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: $2,185
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
22,370 housing units in Siskiyou 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 Siskiyou County
Remediation costs are relatively manageable for most homeowners in Siskiyou 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 Siskiyou 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 Siskiyou County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Montague, | 1,264 | 11 |
| 2 | Lake Shastina C.s.d | 2,790 | 8 |
| 3 | City of Dunsmuir, | 1,707 | 6 |
| 4 | City of Weed, | 2,662 | 6 |
| 5 | Siskiyou Company.service Area #5/carrick | 143 | 6 |
21 total water systems serve Siskiyou County.
All ZIP Codes in Siskiyou County
19 ZIP codes tracked in Siskiyou County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 96014 | Callahan | 99 | A | 0 | $139K |
| 2 | 96027 | Etna | 95 | A | 0 | $315K |
| 3 | 96023 | Dorris | 94 | A | 3 (1 health) | $139K |
| 4 | 96064 | Montague | 94 | A | 2 (1 health) | $247K |
| 5 | 96067 | Mount Shasta | 94 | A | 2 (1 health) | $378K |
| 6 | 96097 | Yreka | 91 | A | 2 (1 health) | $256K |
| 7 | 96032 | Fort Jones | 90 | A | 1 | $293K |
| 8 | 96039 | Happy Camp | 89 | A | 2 (1 health) | $162K |
| 9 | 96038 | Grenada | 88 | A | 1 | $329K |
| 10 | 96057 | Mccloud | 87 | A | 4 (2 health) | $318K |
| 11 | 96094 | Weed | 87 | A | 6 (2 health) | $299K |
| 12 | 96044 | Hornbrook | 86 | A | 3 (2 health) | $211K |
| 13 | 96058 | Macdoel | 85 | A | 3 (1 health) | $143K |
| 14 | 96086 | Seiad Valley | 73 | B | 0 | $260K |
| 15 | 96034 | Gazelle | 66 | C | 0 | $292K |
| 16 | 96037 | Greenview | 66 | C | 0 | — |
| 17 | 96085 | Scott Bar | 66 | C | 0 | — |
| 18 | 96050 | Klamath River | 65 | C | 0 | $238K |
| 19 | 96025 | Dunsmuir | 57 | C | 4 (2 health) | $272K |
Recommended Buyer Guides for Siskiyou County
Editorial-only picks, screened against the EPA detections on file.
- Best Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- Best Lead Paint Test Kits — 71.4% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best HEPA Air Purifiers for Wildfire Smoke — Wildfire is the top compound risk factor
Deep Dive Reports
Detailed analysis for Siskiyou County, California
Overview
Siskiyou County in California covers 19 ZIP codes with an average Home Safety Score of B (83/100).
12 of 19 ZIP codes have recorded EPA violations. 14 health-based violations have been documented.
← Back to California 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.