Madera County, California
16 ZIP codes · Avg score 60/100 · Grade C · Updated 2026-06-03
Water monitoring across Madera County's 16 ZIP codes paints a mid-range picture — solid compliance in some zones, documented concerns in others; most violations on record are concentrated in specific prior years rather than spread evenly across the full compliance history, and the overall county grade has held steady in the middle tier without major shifts in either direction.
How Madera County Compares
How Madera County Compares
Madera County scores 13 points below the California state average (73/100) and 8 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Madera County, California
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13 (asthma 10.3%, diabetes 13.4%)
Estimated additional annual cost per homeowner: $2,334, driven primarily by wildfire
Infrastructure: 0.335% avg pipe failure probability, 33% of ZIPs at high risk
55.1% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Madera County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 27 violations. Past 5 years: 77 total (77 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
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: $2,334
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
73,129 housing units in Madera 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 Madera County
Remediation costs are relatively manageable for most homeowners in Madera 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 Madera 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 Madera County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Sierra Linda Mutual Water Company | 200 | 24 |
| 2 | Cascadel Mutual Water System | 137 | 24 |
| 3 | Leisure Acres Mutual Water Company | 45 | 24 |
| 4 | Yosemite Spring Park Util Company | 5,300 | 15 |
| 5 | Skp Park of the Sierras Inc. | 450 | 15 |
23 total water systems serve Madera County.
All ZIP Codes in Madera County
16 ZIP codes tracked in Madera County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 93636 | Madera | 79 | B | 2 (1 health) | $483K |
| 2 | 93638 | Madera | 79 | B | 2 (1 health) | $292K |
| 3 | 93639 | Madera | 78 | B | 2 (1 health) | — |
| 4 | 93637 | Madera | 74 | B | 2 (1 health) | $369K |
| 5 | 93604 | Bass Lake | 63 | C | 0 | $1043K |
| 6 | 93614 | Coarsegold | 63 | C | 15 (9 health) | $355K |
| 7 | 93610 | Chowchilla | 60 | C | 0 | $342K |
| 8 | 93644 | Oakhurst | 57 | C | 10 (6 health) | $378K |
| 9 | 92234 | Cathedral City | 55 | C | 0 | $421K |
| 10 | 92235 | Cathedral City | 53 | D | 0 | — |
| 11 | 93601 | Ahwahnee | 53 | D | 0 | $393K |
| 12 | 93623 | Fish Camp | 53 | D | 0 | — |
| 13 | 93645 | O Neals | 53 | D | 0 | $367K |
| 14 | 93653 | Raymond | 53 | D | 0 | $518K |
| 15 | 93643 | North Fork | 50 | D | 24 (22 health) | $339K |
| 16 | 93669 | Wishon | 35 | F | 6 (5 health) | $290K |
Recommended Buyer Guides for Madera County
Methodologically, the recommendation order reflects severity in the federal record: contaminants flagged in EPA detection records for this county outrank generic water concerns, FEMA-confirmed hazard ratings shift emergency-related categories upward, and CDC lead-exposure markers govern when lead-test kits and certified filters appear at the top of the list.
- Best Lead Paint Test Kits — 55.1% 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 Madera County, California
Overview
Madera County in California covers 16 ZIP codes with an average Home Safety Score of C (60/100).
8 of 16 ZIP codes have recorded EPA violations. 46 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.