How many water violations are in Riverside County?

Riverside County has 6,103 total drinking water violations across 201 water systems, of which 1,566 are health-based violations. 93.5% of systems have at least one violation.

How many people get water from Riverside County systems?

Water systems in Riverside County serve approximately 2,839,125 people through 201 public water systems.

Has PFAS been detected in Riverside County water?

Under EPA UCMR5, 13 of 31 tested systems in Riverside County had at least one PFAS detection (41.9% of the UCMR5-tested subset - not of all 201 SDWIS systems).

What types of water sources supply Riverside County?

Water systems in Riverside County use GW (175 systems), SW (26 systems) as their primary water sources.

Are health-based violations serious?

Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 25.7% of Riverside County's violations are health-based. Among counties with any SDWIS violations, this extract puts Riverside County in the higher health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

Counties → California

Riverside County, California

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet CA065 · Riverside County 201 sys · 6,103 viol · #12/3254

VIOL-SEVERE · HEALTH-MID · RANK-TOP · PHOTO-FINISH · PFAS-MID · SRC-GW · SYS-LARGE · BOOK-FULL

VIOL-SEVERE 93.5% flagged
HEALTH-MID 25.7% health
RANK-TOP #12/3254
PHOTO-FINISH ±0.1 pp
PFAS-MID 41.9% detect
SRC-GW GW lead 87%
SYS-LARGE 201 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Humboldt County ( -0.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Riverside County ranks #12 of 3,254 counties by people served, and #4 of 58 counties in California. See methodology · corpus placement.

Riverside County standing, mid-flagged corpus third

Flagged-system rate 93.5% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 25.7% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 41.9% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #12 of 3,254 · #4 of 58 in California.

Water Systems

System Name	Population	Violations	PFAS
Eastern Municipal WD	666,581	6	Clean
Riverside, City Of	298,398	1	Detected
Coachella Vwd: Cove Community	270,000	3	Clean
Elsinore Valley MWD	169,455	22	Detected
Corona, City Of	168,575	36	Detected
Rancho California Water District	146,147	4	Detected
Jurupa Community SD	135,093	16	Clean
Anza Community Hall	92,019	18	-
Western MWD	86,062	0	Detected
Indio Water Authority	84,757	14	Clean
Desert Water Agency	74,807	22	Clean
Beaumont Cherry Valley WD	66,841	8	Clean
Goose Creek Golf Club	57,628	24	-
Lake Hemet MWD	52,913	8	Clean
Coachella Water Authority	43,590	24	Clean
Mission Springs WD	43,484	21	Clean
Rubidoux Community SD	36,827	103	Detected
Aguanga Market Water System	36,012	3	-
Hemet, City Of	33,828	53	Clean
Banning, City Of	31,680	23	Detected
Norco, City Of	25,068	144	Detected
La Cocina	24,524	12	-
Temescal Valley Water District	21,971	16	Clean
San Jacinto, City Of	18,950	11	Clean
Western MWD - Murrieta Division	17,453	14	Detected
South Mesa WC	10,108	14	Detected
Blythe - City Of	9,798	23	Clean
Myoma Dunes Mutual Water Company	9,445	1	Clean
Caltrans, Cactus City Rest Area	6,800	26	-
Nuevo Water Company	6,733	16	Detected
Caltrans, Whitewater Rest Area	6,000	22	-
Santa Ana River Water Company	5,848	24	Clean
Valley Auto Water	5,215	3	-
Coachella Vwd: I.D. No. 8	4,600	1	Clean
California Rehabilitation Center - Norco	4,300	69	Detected
Chuckawalla Valley State Prison	4,090	24	Clean
Farm Mutual W.C. (The)	4,026	30	Detected
Idyllwild Water District	3,762	12	-
Box Springs Mutual WC	3,382	16	-
Home Gardens County WD	3,095	176	-
Terwilliger Association	2,401	13	-
Eisenhower Medical Center(water)	2,300	51	-
Cabazon Water District	2,010	59	-
Mecca Arco Travel Center	1,847	69	-
Ladera Golf Club	1,806	0	-
Palm Springs Aerial Tramway	1,799	31	-
Pine Cove Water District	1,540	22	-
Hidden Valley Nature Center	1,210	4	-
Temecula/Vail Lake KOA	1,125	24	-
Glen Ivy Hot Springs	1,087	50	-

Compare beyond California

Mid-flagged peers for Riverside County

Cross-state counties nearest Riverside County on flagged-system share (93.5%) and cumulative violation count (6,103). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Compiled by PlainWater, Drinking Water Quality Editorial Process · May 15, 2026

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.