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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
Water quality data for 15 cities serving 1,692,777 residents
Riverside County in California has an average water quality score of 78/100 (Grade B) based on analysis of 15 municipal water systems. The county's water systems serve approximately 1,692,777 residents.
Water quality in Riverside County is fair, with some cities showing room for improvement. 3 cities have scores below 70, indicating elevated contaminant levels that residents should be aware of. Palm Desert has the best water quality at 97/100.
15 cities ranked by water quality score
| Rank | City | Score | Grade | Population |
|---|---|---|---|---|
| 1 | Palm Desert Top concern: Total Trihalomethanes (18.1% of limit) | 97 | A+ | 53,225 |
| 2 | Eastvale Top concern: Fluoride (17.1% of limit) | 89 | A- | 67,173 |
| 3 | Hemet Top concern: Total Trihalomethanes (16.7% of limit) | 87 | A- | 91,235 |
| 4 | Lake Elsinore Top concern: Haloacetic Acids (42.4% of limit) | 86 | A- | 70,499 |
| 5 | Cathedral City Top concern: Arsenic (14.8% of limit) | 86 | A- | 56,450 |
| 6 | Menifee Top concern: Total Trihalomethanes (18.2% of limit) | 85 | A- | 104,980 |
| 7 | Temecula Top concern: Haloacetic Acids (43.4% of limit) | 83 | B+ | 110,191 |
| 8 | Riverside Top concern: Lead (37.5% of limit) | 82 | B+ | 319,997 |
| 9 | Corona Top concern: Total Trihalomethanes (36.1% of limit) | 76 | B | 155,261 |
| 10 | Murrieta Top concern: Haloacetic Acids (26.8% of limit) | 75 | B | 117,911 |
| 11 | Jurupa Valley Top concern: Total Trihalomethanes (39.7% of limit) | 71 | B- | 111,608 |
| 12 | Palm Springs Top concern: Copper (34.8% of limit) | 71 | B- | 51,897 |
| 13 | Moreno Valley Top concern: Total Trihalomethanes (66.8% of limit) | 69 | C+ | 204,716 |
| 14 | Perris Top concern: Copper (35.6% of limit) | 68 | C+ | 80,899 |
| 15 | Indio Top concern: Lead (65.9% of limit) | 47 | F | 96,735 |
Top detected contaminants across county water systems
| Contaminant | Avg Level | Max Level | EPA Limit | % of Limit | Cities |
|---|---|---|---|---|---|
| Total Trihalomethanes | 19.423 ug/L | 53.425 ug/L | 80 ug/L | 24.3% | 13 |
| Haloacetic Acids | 12.869 ug/L | 31.249 ug/L | 60 ug/L | 21.4% | 13 |
| Copper | 0.254 mg/L | 0.463 mg/L | 1.3 mg/L | 19.6% | 14 |
| Fluoride | 0.734 mg/L | 1.15 mg/L | 4 mg/L | 18.3% | 14 |
| Nitrite | 0.176 mg/L | 0.464 mg/L | 1 mg/L | 17.6% | 13 |
| Lead | 0.003 mg/L | 0.01 mg/L | 0.015 mg/L | 17.3% | 14 |
| Arsenic | 0.002 mg/L | 0.005 mg/L | 0.01 mg/L | 15.1% | 14 |
| Chromium | 0.014 mg/L | 0.047 mg/L | 0.1 mg/L | 14.1% | 15 |
Recent violations across county water systems
Showing 10 of 20 recent violations
Water quality in Riverside County, California reflects the region's unique combination of water sources, treatment infrastructure, and environmental factors. Our comprehensive analysis examines 15 municipal water systems serving a combined population of over 1,692,777 residents.
The county shows moderate water quality performance, with scores ranging from 47/100 in Indio to 97/100 in Palm Desert. This 50-point spread indicates significant variation in water quality across the county, suggesting different water sources or treatment approaches.
The most prevalent contaminants detected across Riverside County water systems include Total Trihalomethanes, Haloacetic Acids, Copper. All monitored contaminants remain within acceptable levels relative to EPA Maximum Contaminant Levels (MCLs).
Water quality in Riverside County is fair but shows room for improvement. Residents in cities scoring below 70 should consider water filtration, particularly for drinking and cooking. Check your specific city's report above for personalized recommendations.
Riverside County has an average water quality score of 78/100 (Grade B) based on analysis of 15 municipal water systems serving 1,692,777 residents.
Palm Desert has the highest water quality score in Riverside County at 97/100. View the detailed report for Palm Desert.
Given the water quality variation across Riverside County, we recommend reviewing your specific city's water quality report. 3 cities have scores below 70, where filtration is particularly recommended.
Click on any city in the rankings table above to view its detailed water quality report, including contaminant levels, EPA compliance history, and filter recommendations.