Community Water System · PWS CA3010038
City of Santa Ana
Operator location Santa Ana, California - UCMR5 detected 5 PFAS compounds (upper-third PFAS panel (> 4 compounds)) on this PWS; SDWIS lists 20 violations and 310,539 people served.
- 310,539
- People served (this PWS)
- 20
- EPA violations (this PWS)
- 4
- Health-based (this PWS)
- 5 PFAS
- UCMR5 (this PWS)
City of Santa Ana standing, low SDWIS violation third
UCMR5 detected 5 PFAS compounds - upper-third PFAS panel (> 4 compounds). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 20% is middle-third health share (≤ 23%). UCMR5: upper-third PFAS panel (> 4 compounds). Population rank #114 of 29,740 among systems serving 500+.
The verdict
City of Santa Ana is in the lower third by violation count (20; lower-third violation load (≤ 21 violations)). A low count does not mean the system is unmonitored - monitoring and reporting violations still appear in SDWIS. Population served is large (310,539; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 20% (middle-third health share (≤ 23%)). UCMR5 detected 5 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- #114 of 29,740
- Population · /systems
- #13 of 1,701
- Population · CA
- 20
- Total EPA violations on record
- 20%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
5 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 45,743
- County
- Orange
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 8
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 4 | 1993 |
| TTHM | MR | 2 | 2013 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2013 |
| Revised Total Coliform Rule | Other | 2 | 2021 |
| Groundwater Rule | MR | 2 | 2016 |
| Coliform (TCR) | MR | 2 | 2010 |
Violation Count vs. the National Corpus
City of Santa Ana has 20 recorded EPA violations, 31% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 67% carry more. 20% of this system's own violations are health-based (4 of 20), and it ranks #114 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)
20 Lower than most fewer violations than 67% 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. 33 of 750 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NEtFOSAA | 9/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 8:2 FTS | 9/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 9/24/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 9/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 9/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 9/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 9/24/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 9/24/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTrDA | 9/24/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| NMeFOSAA | 9/24/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTA | 9/24/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| 4:2 FTS | 9/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 9/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 9/24/2024 | 4.70 ppt | 4.00 ppt | Detected |
| 6:2 FTS | 9/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFNA | 9/24/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 9/24/2024 | 8.00 ppt | 4.00 ppt | Detected |
| PFHxS | 9/24/2024 | 5.00 ppt | 3.00 ppt | Detected |
| PFHpA | 9/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 9/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 9/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 9/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 9/24/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 9/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 9/24/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 9/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 9/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDoA | 9/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 9/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpA | 9/13/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 9/13/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 9/13/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 9/13/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 9/13/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 9/13/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 9/13/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 9/13/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBS | 9/13/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 9/13/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 9/13/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 9/13/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 9/13/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 9/13/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 9/13/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOS | 9/13/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 6:2 FTS | 9/13/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDA | 9/13/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 9/13/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 9/13/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 9/13/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
UCMR5 PFAS record for City of Santa Ana
Open EPA SDWIS federal reports for PWS CA3010038 to cross-check UCMR5 detections and violation codes; state primacy agencies enforce the Safe Drinking Water Act locally.
Sources: EPA SDWIS · California State Water Resources Control Board, Division of Drinking Water
Nationwide peers
20 violations · 310,539 served: nearest cross-state SDWIS matches.
Cross-state systems with similarly light violation ledgers
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with City of Santa Ana
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.