Community Water System · PWS CA1010028
Riverdale Public Utility District
Operator location Riverdale, California - 83% of 126 violations are health-based (upper-third health share (> 23%)); groundwater source; 2,756 served per SDWIS.
- 2,756
- People served (this PWS)
- 126
- EPA violations (this PWS)
- 104
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Riverdale Public Utility District standing, high SDWIS violation third
83% of 126 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 83% is upper-third health share (> 23%). Population rank #11,223 of 29,740 among systems serving 500+.
The verdict
Riverdale Public Utility District sits in the upper third of the sitemap cohort by violation count (126), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 2,756 (mid served population (≤ 3,309)). Health-based share is 83% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #11,223 of 29,740
- Population · /systems
- #804 of 1,701
- Population · CA
- 126
- Total EPA violations on record
- 83%
- 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
- 900
- County
- Fresno
- School/Daycare
- No
- MCL Violations
- 104
- Monitoring Violations
- 22
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 90 | 2014 |
| Nitrate | MR | 10 | 2016 |
| Coliform (TCR) | MCL | 8 | 2013 |
| Lead and Copper Rule | MR | 7 | 2013 |
| Fluoride | MCL | 6 | 2025 |
| TTHM | MR | 3 | 2005 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2005 |
Violation Count vs. the National Corpus
Riverdale Public Utility District has 126 recorded EPA violations, 78% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 22% carry more. 83% of this system's own violations are health-based (104 of 126), and it ranks #11,223 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)
126 Higher than most more violations than 78% 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
Health-based violations on Riverdale Public Utility District
104 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for CA1010028.
Sources: EPA SDWIS · California State Water Resources Control Board, Division of Drinking Water
Nationwide peers
126 violations · 2,756 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Riverdale Public Utility District
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.