Community Water System · PWS CA3310028
Riverside CSA #122-Mesa Verde
Operator location Blythe, California - 90% of 364 violations are health-based (upper-third health share (> 23%)); groundwater source; 766 served per SDWIS.
- 766
- People served (this PWS)
- 364
- EPA violations (this PWS)
- 327
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
Riverside CSA #122-Mesa Verde standing, high SDWIS violation third
90% of 364 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 90% is upper-third health share (> 23%). UCMR5: UCMR5 tested, none detected. Population rank #23,106 of 29,740 among systems serving 500+.
The verdict
Riverside CSA #122-Mesa Verde sits in the upper third of the sitemap cohort by violation count (364), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (766; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 90% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #23,106 of 29,740
- Population · /systems
- #1,346 of 1,701
- Population · CA
- 364
- Total EPA violations on record
- 90%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
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 |
Violation Count vs. the National Corpus
Riverside CSA #122-Mesa Verde has 364 recorded EPA violations, 93% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 7% carry more. 90% of this system's own violations are health-based (327 of 364), and it ranks #23,106 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
364 Higher than most more violations than 93% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
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 |
Health-based violations on Riverside CSA #122-Mesa Verde
327 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for CA3310028.
Sources: EPA SDWIS · California State Water Resources Control Board, Division of Drinking Water
Nationwide peers
364 violations · 766 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Riverside CSA #122-Mesa Verde
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in California compares on the same EPA violation measures. California systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.