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Updated 2026-10-15
County water report

Riverside County Water Quality: 13 Cities Ranked by the Records

Riverside County, California: 13 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my systemOpen on the mapPrivate wells in Riverside County
Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

LithiumDetected in 8 systems of 13 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest87.7 µg/L
Perfluorooctanesulfonic acid (PFOS)Detected in 2 systems of 13 tested4.0 ng/L federal MCL (2024) · US EPAHighest31.4 ng/L
  • NORCO, CITY OF31.4 ng/LSample date: 2023-09-12 to 2024-06-18
  • RIVERSIDE, CITY OF4 ng/LSample date: 2023-02-07 to 2023-11-20
  • BANNING, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-09-13 to 2024-03-27
  • BEAUMONT CHERRY VALLEY WDNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-03-16 to 2023-09-26
  • BLYTHE - CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-04 to 2024-12-03
  • COACHELLA WATER AUTHORITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-08-16 to 2024-02-28
  • CORONA, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-09-20 to 2024-09-11
  • DESERT WATER AGENCYNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-06-23 to 2024-06-21
  • EASTERN MUNICIPAL WDNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-07-05 to 2024-08-12
  • ELSINORE VALLEY MWDNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-02-16 to 2025-12-08
  • HEMET, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-09-16 to 2025-03-24
  • INDIO WATER AUTHORITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-10-10 to 2024-03-27
  • SAN JACINTO, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-11-06
Perfluorooctanoic acid (PFOA)Detected in 1 system of 13 tested4.0 ng/L federal MCL (2024) · US EPAHighest13.7 ng/L
  • NORCO, CITY OF13.7 ng/LSample date: 2023-09-12 to 2024-06-18
  • BANNING, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-09-13 to 2024-03-27
  • BEAUMONT CHERRY VALLEY WDNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-03-16 to 2023-09-26
  • BLYTHE - CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-04 to 2024-12-03
  • COACHELLA WATER AUTHORITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-08-16 to 2024-02-28
  • CORONA, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-09-20 to 2024-09-11
  • DESERT WATER AGENCYNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-06-23 to 2024-06-21
  • EASTERN MUNICIPAL WDNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-07-05 to 2024-08-12
  • ELSINORE VALLEY MWDNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-02-16 to 2025-12-08
  • HEMET, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-09-16 to 2025-03-24
  • INDIO WATER AUTHORITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-10-10 to 2024-03-27
  • RIVERSIDE, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-02-07 to 2023-11-20
  • SAN JACINTO, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-11-06
Copper (90th percentile)Detected in 1 system1.3 mg/L federal action level · US EPAHighest2.1 mg/L
Perfluorohexanesulfonic acid (PFHxS)Detected in 2 systems of 13 tested10 ng/L federal MCL (2024) · US EPAHighest13.8 ng/L
  • NORCO, CITY OF13.8 ng/LSample date: 2023-09-12 to 2024-06-18
  • CORONA, CITY OF3.3 ng/LSample date: 2023-09-20 to 2024-09-11
  • BANNING, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-09-13 to 2024-03-27
  • BEAUMONT CHERRY VALLEY WDNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-16 to 2023-09-26
  • BLYTHE - CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-04 to 2024-12-03
  • COACHELLA WATER AUTHORITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-08-16 to 2024-02-28
  • DESERT WATER AGENCYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-06-23 to 2024-06-21
  • EASTERN MUNICIPAL WDNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-07-05 to 2024-08-12
  • ELSINORE VALLEY MWDNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-02-16 to 2025-12-08
  • HEMET, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-09-16 to 2025-03-24
  • INDIO WATER AUTHORITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-10-10 to 2024-03-27
  • RIVERSIDE, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-02-07 to 2023-11-20
  • SAN JACINTO, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-11-06
Water hardnessDetected in 3 systemsAesthetic, no federal health limit · USGSHighest12.05 gpg
Lead (90th percentile)Detected in 7 systems of 13 tested15 µg/L federal action level · US EPAHighest7.8 µg/L
Total trihalomethanes (TTHM)Detected in 1 system80 ppb federal MCL · US EPAHighest6.3 ppb
4 more contaminants detectedShow
Perfluorobutanesulfonic acid (PFBS)Detected in 1 system of 13 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest12.2 ng/L
  • NORCO, CITY OF12.2 ng/LSample date: 2023-09-12 to 2024-06-18
  • BANNING, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-09-13 to 2024-03-27
  • BEAUMONT CHERRY VALLEY WDNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-16 to 2023-09-26
  • BLYTHE - CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-04 to 2024-12-03
  • COACHELLA WATER AUTHORITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-08-16 to 2024-02-28
  • CORONA, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-09-20 to 2024-09-11
  • DESERT WATER AGENCYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-06-23 to 2024-06-21
  • EASTERN MUNICIPAL WDNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-07-05 to 2024-08-12
  • ELSINORE VALLEY MWDNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-02-16 to 2025-12-08
  • HEMET, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-09-16 to 2025-03-24
  • INDIO WATER AUTHORITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-10-10 to 2024-03-27
  • RIVERSIDE, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-02-07 to 2023-11-20
  • SAN JACINTO, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-11-06
Perfluorohexanoic acid (PFHxA)Detected in 3 systems of 13 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest7.3 ng/L
  • NORCO, CITY OF7.3 ng/LSample date: 2023-09-12 to 2024-06-18
  • RIVERSIDE, CITY OF4.1 ng/LSample date: 2023-02-07 to 2023-11-20
  • CORONA, CITY OF3.8 ng/LSample date: 2023-09-20 to 2024-09-11
  • BANNING, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-09-13 to 2024-03-27
  • BEAUMONT CHERRY VALLEY WDNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-16 to 2023-09-26
  • BLYTHE - CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-04 to 2024-12-03
  • COACHELLA WATER AUTHORITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-08-16 to 2024-02-28
  • DESERT WATER AGENCYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-06-23 to 2024-06-21
  • EASTERN MUNICIPAL WDNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-07-05 to 2024-08-12
  • ELSINORE VALLEY MWDNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-02-16 to 2025-12-08
  • HEMET, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-09-16 to 2025-03-24
  • INDIO WATER AUTHORITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-10-10 to 2024-03-27
  • SAN JACINTO, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-11-06
Perfluorobutanoic acid (PFBA)Detected in 4 systems of 13 testedNo federal or state limit; shown for transparencyHighest17.9 ng/L
Perfluoropentanoic acid (PFPeA)Detected in 3 systems of 13 testedNo federal or state limit; shown for transparencyHighest11.9 ng/L
  • NORCO, CITY OF11.9 ng/LSample date: 2023-09-12 to 2024-06-18
  • RIVERSIDE, CITY OF6.7 ng/LSample date: 2023-02-07 to 2023-11-20
  • CORONA, CITY OF6.1 ng/LSample date: 2023-09-20 to 2024-09-11
  • BANNING, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-09-13 to 2024-03-27
  • BEAUMONT CHERRY VALLEY WDNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-16 to 2023-09-26
  • BLYTHE - CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-04 to 2024-12-03
  • COACHELLA WATER AUTHORITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-08-16 to 2024-02-28
  • DESERT WATER AGENCYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-06-23 to 2024-06-21
  • EASTERN MUNICIPAL WDNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-07-05 to 2024-08-12
  • ELSINORE VALLEY MWDNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-02-16 to 2025-12-08
  • HEMET, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-09-16 to 2025-03-24
  • INDIO WATER AUTHORITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-10-10 to 2024-03-27
  • SAN JACINTO, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-11-06
22 PFAS tested, none detected in any systemShow

Tested in these 13 systems: BANNING, CITY OF, BEAUMONT CHERRY VALLEY WD, BLYTHE - CITY OF, COACHELLA WATER AUTHORITY, CORONA, CITY OF, DESERT WATER AGENCY, EASTERN MUNICIPAL WD, ELSINORE VALLEY MWD, HEMET, CITY OF, INDIO WATER AUTHORITY, NORCO, CITY OF, RIVERSIDE, CITY OF, SAN JACINTO, CITY OF

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
  • 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
  • 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
  • Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
  • N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
  • N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
  • Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
  • Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
  • Perfluoro-3-methoxypropanoic acid (PFMPA)
  • Perfluoro-4-methoxybutanoic acid (PFMBA)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluoroheptanoic acid (PFHpA)
  • Perfluorononanoic acid (PFNA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
13 cities

Cities ranked by the records

Showing 6 of 13 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Riverside County1 of 13 city reports had a PFAS sample above a 2024 EPA limit
  1. Norco31.4 ng/L
  2. Riverside4 ng/L
4.0 ng/L federal MCL · PFOS, ng/LPFAS in California
Lead

0of 13 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in California
Hard water

3cities report hardness · hardest Moreno Valley, 12.05 gpg

3 of 3 are hard on the USGS scale. An aesthetic measure with no federal health limit.

Hard water explained
Who supplies the county

Largest water systems

  1. Moreno ValleyEASTERN MUNICIPAL WD · CA3310009
    659,923 served
  2. RiversideRIVERSIDE, CITY OF · CA3310031
    302,776 served
  3. Lake ElsinoreELSINORE VALLEY MWD · CA3310012
    169,455 served
  4. CoronaCORONA, CITY OF · CA3310037
    169,380 served
  5. IndioINDIO WATER AUTHORITY · CA3310020
    89,137 served
  6. Palm SpringsDESERT WATER AGENCY · CA3310005
    75,588 served
  7. BeaumontBEAUMONT CHERRY VALLEY WD · CA3310002
    66,841 served
  8. CoachellaCOACHELLA WATER AUTHORITY · CA3310007
    43,590 served
  9. HemetHEMET, CITY OF · CA3310016
    33,591 served
  10. BanningBANNING, CITY OF · CA3310006
    31,680 served
Questions

Frequently asked

How does Riverside County tap water compare across cities?

PurityMap ranks 13 cities in Riverside County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Indio's main water system: INDIO WATER AUTHORITY · PWSID CA3310020 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Riverside County cities had a PFAS sample above a 2024 EPA limit?

1 of 13 Riverside County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Norco (PFOS 31.4 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 5.

Is there lead in Riverside County tap water?

Utilities report lead as a 90th-percentile result from home taps. 7 of 13 Riverside County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

Does Riverside County have hard water?

Hardness is published in utility water-quality reports for 3 Riverside County cities on record; the hardest is Moreno Valley at 12.05 grains per gallon. Hardness affects scale and appliances; it is not a health finding.

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