States › California › Riverside County

Riverside County, CA Water Quality

Water quality data for 24 public water systems serving Riverside County, California — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 24 water systems · 73 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Riverside County Earns a A

Riverside County: 73 communities across 24 water systems. 95.9% have no open violations.

  • Median lead where detected: 2.80 ppb
  • 41 communities with a lead detection, 32 reporting none detected
  • 2 communities with PFAS above the federal limit
  • 9 with significant inspection deficiencies
  • 95.9% of communities have no open violations
2.8 ppb
Median Lead Level
County-wide, 90th percentile
24
Water Systems
Active CWS & NTNCWS
95%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Riverside
    1.00 ppb
    No federal limits exceeded on record
    A
  • Moreno Valley
    2.80 ppb
    No federal limits exceeded on record
    A
  • Menifee
    2.80 ppb
    No federal limits exceeded on record
    A
  • Perris
    2.80 ppb
    No federal limits exceeded on record
    A
  • Eastvale
    Not detected
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Calimesa
    Not detected
    Copper above the 1,300 ppb action level
    D
  • Anza
    Not detected
    1 violation currently open
    D
  • Norco
    Not detected
    PFAS above the limit at 2 of 6 sampling points
    C
  • Blythe
    5.50 ppb
    Copper above the 1,300 ppb action level
    C
  • Idyllwild-Pine Cove
    2.90 ppb
    Copper above the 1,300 ppb action level
    C
County Lead Level — Median 2.8 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.8 ppb — 18.7% of the federal action level
Systems by Lead Level
Under 5 ppb
38
5 – 10 ppb
3
No Data
32

All Cities in Riverside County

Riverside 1.00 ppb A
Moreno Valley 2.80 ppb A
Corona 3.70 ppb A
Menifee 2.80 ppb A
Lake Elsinore 1.30 ppb A
Perris 2.80 ppb A
Eastvale Not detected A
Hemet 2.80 ppb A
Jurupa Valley Not detected A
Murrieta 2.80 ppb A
Temecula 2.80 ppb A
Beaumont 7.80 ppb A
Palm Desert Not detected A
Indio Not detected A
Cathedral City Not detected A
Palm Springs Not detected A
San Jacinto 2.80 ppb A
La Quinta Not detected A
French Valley 2.80 ppb A
Wildomar 1.30 ppb A
Banning Not detected A
Norco Not detected C
Coachella Not detected A
Temescal Valley Not detected A
Mead Valley 2.80 ppb A
Rancho Mirage Not detected A
Desert Hot Springs Not detected A
Woodcrest 1.30 ppb A
Lakeland Village 1.30 ppb A
Blythe 5.50 ppb C
Canyon Lake 1.30 ppb A
East Hemet 2.80 ppb A
El Sobrante 1.30 ppb A
Good Hope 2.80 ppb A
Valle Vista 2.80 ppb A
Mecca Not detected A
Thousand Palms Not detected A
Homeland 2.80 ppb A
Desert Palms Not detected A
Cherry Valley 7.80 ppb A
Calimesa Not detected D
Lake Mathews 1.30 ppb A
El Cerrito 3.70 ppb A
Home Gardens 1.00 ppb A
Bermuda Dunes Not detected A
Indian Wells Not detected A
Highgrove 1.50 ppb C
Nuevo 2.80 ppb A
North Shore Not detected A
Oasis Not detected A
Meadowbrook 1.30 ppb A
Winchester 2.80 ppb A
Green Acres 2.80 ppb A
Garnet Not detected A
Desert Edge Not detected A
Coronita 3.70 ppb A
Vista Santa Rosa Not detected A
Thermal Not detected A
Sky Valley Not detected A
Idyllwild-Pine Cove 2.90 ppb C
Romoland 2.80 ppb A
Warm Springs 1.30 ppb A
Cabazon 1.20 ppb B
Sage 2.80 ppb A
Lakeview 2.80 ppb A
Indio Hills Not detected A
March ARB 1.30 ppb A
Mesa Verde Not detected A
Ripley Not detected C
Anza Not detected D
Whitewater Not detected A
Desert Center 0.80 ppb B
Mountain Center Not detected B
Showing 73 cities
No active violations Active violations

About Riverside County Drinking Water

Riverside County is served by 24 water systems covering 73 communities. 96% have no open violations.

Of the communities reporting lead results, 41 recorded a detection, with a median of 2.80 ppb — 19% of the federal action level. 32 reported none detected, which means below the laboratory limit rather than an absence of lead.

2 of 73 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded significant deficiencies at 9 of them.

Frequently Asked Questions

Is Riverside County tap water safe to drink?▼
96% of communities have no open violation. 2 of 73 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Riverside County?▼
Among communities with a detection the median is 2.80 ppb, 19% of the 15 ppb action level. 32 reported none detected and 0 reported no result.
How many water systems serve Riverside County?▼
24 community water systems serve 73 communities here.
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