Riverside County, California
101 ZIP codes · Avg score 73/100 · Grade B · Updated 2026-06-03
Water systems in Riverside County serve 101 ZIP codes with few reported safety events.
How Riverside County Compares
How Riverside County Compares
Riverside County scores 0 points above the California state average (73/100) and 5 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Riverside County, California
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.1 (asthma 9.5%, diabetes 12.4%)
Estimated additional annual cost per homeowner: $3,329, driven primarily by wildfire
Infrastructure: 0.275% avg pipe failure probability, 5% of ZIPs at high risk
45% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Riverside County water systems. Health-based shown in red, total in blue.
Peak year: 2022 with 36 violations. Past 5 years: 97 total (97 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: $3,329
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
825,619 housing units in Riverside 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 Riverside County
Remediation costs are relatively manageable for most homeowners in Riverside 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 Riverside 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 Riverside County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Eastern Municipal Water District | 666,581 | 61 |
| 2 | COACHELLA VWD: COVE COMMUNITY | 270,000 | 60 |
| 3 | Rancho California Water District | 146,147 | 57 |
| 4 | DESERT WATER AGENCY | 74,807 | 38 |
| 5 | Indio Water Authority | 84,757 | 36 |
82 total water systems serve Riverside County.
All ZIP Codes in Riverside County
101 ZIP codes tracked in Riverside County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 92230 | Cabazon | 83 | B | 0 | $260K |
| 2 | 92239 | Desert Center | 83 | B | 0 | $221K |
| 3 | 92501 | Riverside | 83 | B | 0 | $466K |
| 4 | 92502 | Riverside | 83 | B | 0 | — |
| 5 | 92503 | Riverside | 83 | B | 0 | $556K |
| 6 | 92504 | Riverside | 83 | B | 0 | $502K |
| 7 | 92505 | Riverside | 83 | B | 0 | $521K |
| 8 | 92506 | Riverside | 83 | B | 0 | $635K |
| 9 | 92507 | Riverside | 83 | B | 0 | $503K |
| 10 | 92508 | Riverside | 83 | B | 0 | $657K |
| 11 | 92513 | Riverside | 83 | B | 0 | — |
| 12 | 92514 | Riverside | 83 | B | 0 | — |
| 13 | 92515 | Riverside | 83 | B | 0 | — |
| 14 | 92516 | Riverside | 83 | B | 0 | — |
| 15 | 92517 | Riverside | 83 | B | 0 | — |
| 16 | 92519 | Riverside | 83 | B | 0 | — |
| 17 | 92521 | Riverside | 83 | B | 0 | — |
| 18 | 92522 | Riverside | 83 | B | 0 | — |
| 19 | 92532 | Lake Elsinore | 83 | B | 0 | $553K |
| 20 | 92551 | Moreno Valley | 83 | B | 0 | $436K |
| 21 | 92552 | Moreno Valley | 83 | B | 0 | — |
| 22 | 92553 | Moreno Valley | 83 | B | 0 | $413K |
| 23 | 92554 | Moreno Valley | 83 | B | 0 | — |
| 24 | 92555 | Moreno Valley | 83 | B | 0 | $543K |
| 25 | 92556 | Moreno Valley | 83 | B | 0 | — |
| 26 | 92557 | Moreno Valley | 83 | B | 0 | $472K |
| 27 | 92567 | Nuevo | 83 | B | 0 | $497K |
| 28 | 92571 | Perris | 83 | B | 0 | $431K |
| 29 | 92572 | Perris | 83 | B | 0 | — |
| 30 | 92581 | San Jacinto | 83 | B | 0 | — |
| 31 | 92582 | San Jacinto | 83 | B | 0 | $439K |
| 32 | 92599 | Perris | 83 | B | 0 | — |
| 33 | 92877 | Corona | 83 | B | 1 | — |
| 34 | 92879 | Corona | 83 | B | 1 | $592K |
| 35 | 92881 | Corona | 83 | B | 1 | $724K |
| 36 | 92883 | Corona | 83 | B | 1 | $672K |
| 37 | 92543 | Hemet | 82 | B | 3 (1 health) | $251K |
| 38 | 92545 | Hemet | 82 | B | 3 (1 health) | $335K |
| 39 | 92546 | Hemet | 82 | B | 3 (1 health) | — |
| 40 | 92589 | Temecula | 80 | B | 7 | — |
| 41 | 92591 | Temecula | 80 | B | 7 | $650K |
| 42 | 92592 | Temecula | 80 | B | 7 | $664K |
| 43 | 92593 | Temecula | 80 | B | 7 | — |
| 44 | 92220 | Banning | 79 | B | 5 | $325K |
| 45 | 92263 | Palm Springs | 79 | B | 4 (1 health) | — |
| 46 | 92549 | Idyllwild | 79 | B | 5 | $486K |
| 47 | 92561 | Mountain Center | 79 | B | 1 (1 health) | $560K |
| 48 | 92292 | Palm Springs | 78 | B | 4 (1 health) | — |
| 49 | 92509 | Riverside | 78 | B | 0 | $501K |
| 50 | 92531 | Lake Elsinore | 78 | B | 0 | — |
| 51 | 92570 | Perris | 78 | B | 0 | $420K |
| 52 | 92583 | San Jacinto | 78 | B | 0 | $340K |
| 53 | 92878 | Corona | 78 | B | 1 | — |
| 54 | 92880 | Corona | 78 | B | 1 | $724K |
| 55 | 92882 | Corona | 78 | B | 1 | $654K |
| 56 | 92544 | Hemet | 77 | B | 3 (1 health) | $356K |
| 57 | 92223 | Beaumont | 76 | B | 0 | $458K |
| 58 | 92225 | Blythe | 76 | B | 2 | $197K |
| 59 | 92536 | Aguanga | 75 | B | 0 | $399K |
| 60 | 92590 | Temecula | 75 | B | 7 | $1201K |
| 61 | 92595 | Wildomar | 74 | B | 2 | $524K |
| 62 | 92226 | Blythe | 73 | B | 2 | — |
| 63 | 92320 | Calimesa | 73 | B | 2 | $423K |
| 64 | 92530 | Lake Elsinore | 73 | B | 0 | $467K |
| 65 | 92236 | Coachella | 71 | B | 2 | $343K |
| 66 | 92240 | Desert Hot Springs | 70 | B | 1 | $294K |
| 67 | 92241 | Desert Hot Springs | 70 | B | 1 | $93K |
| 68 | 92262 | Palm Springs | 69 | C | 4 (1 health) | $601K |
| 69 | 92264 | Palm Springs | 69 | C | 4 (1 health) | $498K |
| 70 | 92201 | Indio | 67 | C | 11 (2 health) | $373K |
| 71 | 92203 | Indio | 67 | C | 11 (2 health) | $497K |
| 72 | 92255 | Palm Desert | 66 | C | 3 (1 health) | — |
| 73 | 92211 | Palm Desert | 65 | C | 3 (1 health) | $536K |
| 74 | 92261 | Palm Desert | 65 | C | 3 (1 health) | — |
| 75 | 92860 | Norco | 65 | C | 1 | $733K |
| 76 | 92247 | La Quinta | 63 | C | 0 | — |
| 77 | 92254 | Mecca | 63 | C | 0 | $207K |
| 78 | 92256 | Morongo Valley | 63 | C | 0 | $265K |
| 79 | 92282 | Whitewater | 63 | C | 0 | $273K |
| 80 | 92548 | Homeland | 63 | C | 0 | $217K |
| 81 | 92584 | Menifee | 63 | C | 0 | $562K |
| 82 | 92586 | Sun City | 63 | C | 0 | $338K |
| 83 | 92587 | Sun City | 63 | C | 0 | $594K |
| 84 | 92596 | Winchester | 63 | C | 0 | $616K |
| 85 | 92202 | Indio | 62 | C | 11 (2 health) | — |
| 86 | 92539 | Anza | 58 | C | 14 (12 health) | $298K |
| 87 | 91752 | Mira Loma | 55 | C | 0 | $648K |
| 88 | 92260 | Palm Desert | 55 | C | 3 (1 health) | $464K |
| 89 | 92585 | Sun City | 55 | C | 0 | $500K |
| 90 | 91743 | Guasti | 53 | D | 0 | — |
| 91 | 92248 | La Quinta | 53 | D | 0 | — |
| 92 | 92258 | North Palm Springs | 53 | D | 0 | — |
| 93 | 92275 | Salton City | 53 | D | 0 | $140K |
| 94 | 92518 | March Air Reserve Base | 53 | D | 0 | — |
| 95 | 92210 | Indian Wells | 50 | D | 0 | $1002K |
| 96 | 92253 | La Quinta | 50 | D | 0 | $613K |
| 97 | 92270 | Rancho Mirage | 50 | D | 0 | $748K |
| 98 | 92276 | Thousand Palms | 50 | D | 0 | $261K |
| 99 | 92563 | Murrieta | 42 | D | 7 (7 health) | $616K |
| 100 | 92564 | Murrieta | 42 | D | 7 (7 health) | — |
| 101 | 92562 | Murrieta | 37 | F | 7 (7 health) | $629K |
Recommended Buyer Guides for Riverside County
Filtered against federal data, fitted to local risks.
- Best Water Filters for Lead — Lead above EPA action level in 3 ZIP codes
- 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 Riverside County, California
Overview
Riverside County in California covers 101 ZIP codes with an average Home Safety Score of B (73/100).
42 of 101 ZIP codes have recorded EPA violations. 52 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.