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Community Water System · PWS CA3310028

Riverside CSA #122-Mesa Verde

Blythe, California 92225 - drinking water served from groundwater sources to 766 people, tracked in EPA SDWIS and UCMR5.

766
People served
364
EPA violations
327
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 364 drinking-water violations at Riverside CSA #122-Mesa Verde, 90% of them health-based - above the California per-system average.

364
Total EPA violations on record
90%
Health-based (MCL / treatment failure)
766
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Riverside CSA #122-Mesa Verde

Riverside CSA #122-Mesa Verde is a local-owned community water system that delivers drinking water to 766 residents in Blythe, California (Riverside County) through 330 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 364 total violations for this system , of which 327 (90%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 37 monitoring and reporting violations are on file. The most recent violation on record dates to 2008.

The most frequently cited contaminant at this system is Fluoride, recorded in 232 violations (MCL, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

Across California, EPA tracks 7,249 public water systems serving 42,404,883 people, with 153,308 cumulative violations and 63,983 health-based violations on record. About 89% of systems in the state carry at least one violation, and state-wide the average per system is 21.1 violations. Statewide, 447 of 694 UCMR5-tested systems have reported PFAS detections (64.4%).

Riverside CSA #122-Mesa Verde's 364 violations sit above the California average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
766
Total Violations
364
Health-Based Violations
327
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
330
County
Riverside
School/Daycare
No
MCL Violations
327
Monitoring Violations
37
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Fluoride MCL 232 1989
Selenium MCL 77 1986
Nitrate MCL 14 1986
Coliform (TCR) MR 8 2003
Lead and Copper Rule MR 5 2002
Coliform (TCR) MCL 4 2008
Nitrate-Nitrite MR 2 2000
Antimony, Total MR 2 2008
Arsenic MR 2 2008
Barium MR 2 2008
Cadmium MR 2 2008
Chromium MR 2 2008
Mercury MR 2 2008
Nickel MR 2 2008
Selenium MR 2 2008
Fluoride MR 2 2008
Thallium, Total MR 2 2008
Beryllium, Total MR 2 2008

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 58 samples detected PFAS.

Contaminant Date Result MRL Status
PFOS 5/6/2025 <4.00 ppt 4.00 ppt Not Detected
PFOA 5/6/2025 <4.00 ppt 4.00 ppt Not Detected
PFDA 5/6/2025 <3.00 ppt 3.00 ppt Not Detected
PFDoA 5/6/2025 <3.00 ppt 3.00 ppt Not Detected
PFUnA 5/6/2025 <2.00 ppt 2.00 ppt Not Detected
PFNA 5/6/2025 <4.00 ppt 4.00 ppt Not Detected
6:2 FTS 5/6/2025 <5.00 ppt 5.00 ppt Not Detected
PFHxA 5/6/2025 <3.00 ppt 3.00 ppt Not Detected
4:2 FTS 5/6/2025 <3.00 ppt 3.00 ppt Not Detected
PFPeA 5/6/2025 <3.00 ppt 3.00 ppt Not Detected
PFMBA 5/6/2025 <3.00 ppt 3.00 ppt Not Detected
PFEESA 5/6/2025 <3.00 ppt 3.00 ppt Not Detected
NFDHA 5/6/2025 <20.00 ppt 20.00 ppt Not Detected
8:2 FTS 5/6/2025 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 5/6/2025 <2.00 ppt 2.00 ppt Not Detected
PFHpS 5/6/2025 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 5/6/2025 <5.00 ppt 5.00 ppt Not Detected
PFHxS 5/6/2025 <3.00 ppt 3.00 ppt Not Detected
PFBS 5/6/2025 <3.00 ppt 3.00 ppt Not Detected
PFPeS 5/6/2025 <4.00 ppt 4.00 ppt Not Detected
PFTrDA 5/6/2025 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 5/6/2025 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 5/6/2025 <6.00 ppt 6.00 ppt Not Detected
PFMPA 5/6/2025 <4.00 ppt 4.00 ppt Not Detected
ADONA 5/6/2025 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 5/6/2025 <5.00 ppt 5.00 ppt Not Detected
PFBA 5/6/2025 <5.00 ppt 5.00 ppt Not Detected
PFHpA 5/6/2025 <3.00 ppt 3.00 ppt Not Detected
PFTA 5/6/2025 <8.00 ppt 8.00 ppt Not Detected
11Cl-PF3OUdS 11/4/2025 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 11/4/2025 <3.00 ppt 3.00 ppt Not Detected
ADONA 11/4/2025 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 11/4/2025 <5.00 ppt 5.00 ppt Not Detected
PFBA 11/4/2025 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 11/4/2025 <5.00 ppt 5.00 ppt Not Detected
NFDHA 11/4/2025 <20.00 ppt 20.00 ppt Not Detected
PFPeS 11/4/2025 <4.00 ppt 4.00 ppt Not Detected
PFHpS 11/4/2025 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 11/4/2025 <6.00 ppt 6.00 ppt Not Detected
PFTA 11/4/2025 <8.00 ppt 8.00 ppt Not Detected
NEtFOSAA 11/4/2025 <5.00 ppt 5.00 ppt Not Detected
PFUnA 11/4/2025 <2.00 ppt 2.00 ppt Not Detected
PFTrDA 11/4/2025 <7.00 ppt 7.00 ppt Not Detected
PFEESA 11/4/2025 <3.00 ppt 3.00 ppt Not Detected
PFHxA 11/4/2025 <3.00 ppt 3.00 ppt Not Detected
PFMPA 11/4/2025 <4.00 ppt 4.00 ppt Not Detected
9Cl-PF3ONS 11/4/2025 <2.00 ppt 2.00 ppt Not Detected
PFMBA 11/4/2025 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 11/4/2025 <5.00 ppt 5.00 ppt Not Detected
PFBS 11/4/2025 <3.00 ppt 3.00 ppt Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Riverside CSA #122-Mesa Verde.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID CA3310028 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

California Drinking Water Authority

California State Water Resources Control Board, Division of Drinking Water is the primacy agency that licenses and inspects Riverside CSA #122-Mesa Verde under EPA-delegated authority.

Open CA regulator portal

Source: California State Water Resources Control Board, Division of Drinking Water

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2008 Coliform (TCR) MCL 4 SDWIS / CA3310028 / 3100
2008 Antimony, Total MR 2 SDWIS / CA3310028 / 1074
2008 Arsenic MR 2 SDWIS / CA3310028 / 1005
2008 Barium MR 2 SDWIS / CA3310028 / 1010
2008 Cadmium MR 2 SDWIS / CA3310028 / 1015
2008 Chromium MR 2 SDWIS / CA3310028 / 1020
2008 Mercury MR 2 SDWIS / CA3310028 / 1035
2008 Nickel MR 2 SDWIS / CA3310028 / 1036
2008 Selenium MR 2 SDWIS / CA3310028 / 1045
2008 Fluoride MR 2 SDWIS / CA3310028 / 1025
2008 Thallium, Total MR 2 SDWIS / CA3310028 / 1085
2008 Beryllium, Total MR 2 SDWIS / CA3310028 / 1075
2003 Coliform (TCR) MR 8 SDWIS / CA3310028 / 3100
2002 Lead and Copper Rule MR 5 SDWIS / CA3310028 / 5000
2000 Nitrate-Nitrite MR 2 SDWIS / CA3310028 / 1038

How Riverside CSA #122-Mesa Verde Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Riverside CSA #122-Mesa Verde California avg Federal benchmark
Total violations 364 21.1 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 327 8.8 Indicates a contaminant exceeded a federal MCL
PFAS detection None 64.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 766 5,850 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 7,249 regulated public water systems in California.

Federal MCL reference, Safe Drinking Water Act thresholds
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Riverside CSA #122-Mesa Verde water safe to drink?
Riverside CSA #122-Mesa Verde (PWS ID: CA3310028) has 364 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 766 people using Groundwater sources.
How many people does Riverside CSA #122-Mesa Verde serve?
Riverside CSA #122-Mesa Verde serves 766 people in Blythe, California. It is a Local-owned system using Groundwater water sources with 330 service connections.
What type of violations does Riverside CSA #122-Mesa Verde have?
Riverside CSA #122-Mesa Verde has 364 total violations: 327 health-based violations (MCL exceedances or treatment failures), 37 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Riverside CSA #122-Mesa Verde water?
No. Riverside CSA #122-Mesa Verde was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Riverside CSA #122-Mesa Verde use?
Riverside CSA #122-Mesa Verde uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from?
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.
Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from 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.