Non-Transient Non-Community Water System · PWS CA3700963
Potrero Elementary School
Operator location Pine Valley, California - 38% of 16 violations are health-based (upper-third health share (> 23%)); groundwater source; 300 served per SDWIS.
- 300
- People served (this PWS)
- 16
- EPA violations (this PWS)
- 6
- Health-based (this PWS)
- 9 PFAS
- UCMR5 (this PWS)
Potrero Elementary School standing, low SDWIS violation third
38% of 16 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 38% is upper-third health share (> 23%). UCMR5: upper-third PFAS panel (> 4 compounds).
The verdict
Potrero Elementary School is in the lower third by violation count (16; 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 smaller (300; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 38% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 detected 9 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- 16
- Total EPA violations on record
- 38%
- Health-based (MCL / treatment failure)
- 300
- People served by this PWS (SDWIS)
- 9
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
9 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Local
- Connections
- 19
- County
- San Diego
- School/Daycare
- Yes
- MCL Violations
- 6
- Monitoring Violations
- 6
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate-Nitrite | MCL | 4 | 2010 |
| Coliform (TCR) | MR | 4 | 2008 |
| Coliform (TCR) | MCL | 2 | 2007 |
| Consumer Confidence Rule | Other | 2 | 2008 |
| Gross Alpha, Excl. Radon and U | MR | 2 | 1981 |
Violation Count vs. the National Corpus
Potrero Elementary School has 16 recorded EPA violations, 26% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 72% carry more. 38% of this system's own violations are health-based (6 of 16), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
16 Lower than most fewer violations than 72% 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. 18 of 58 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFOS | 5/15/2024 | 50.10 ppt | 4.00 ppt | Detected |
| PFPeA | 5/15/2024 | 62.00 ppt | 3.00 ppt | Detected |
| PFMBA | 5/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 5/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 5/15/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFHpS | 5/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 5/15/2024 | 72.70 ppt | 3.00 ppt | Detected |
| PFMPA | 5/15/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 5/15/2024 | 10.20 ppt | 4.00 ppt | Detected |
| PFPeS | 5/15/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 5/15/2024 | 188.30 ppt | 4.00 ppt | Detected |
| PFDA | 5/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 5/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 5/15/2024 | 95.20 ppt | 3.00 ppt | Detected |
| PFUnA | 5/15/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 5/15/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 5/15/2024 | 250.20 ppt | 3.00 ppt | Detected |
| NMeFOSAA | 5/15/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFBS | 5/15/2024 | 5.90 ppt | 3.00 ppt | Detected |
| 8:2 FTS | 5/15/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 5/15/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 5/15/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 5/15/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 5/15/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 5/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 5/15/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 5/15/2024 | 13.10 ppt | 5.00 ppt | Detected |
| 6:2 FTS | 5/15/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 5/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 11/19/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFTA | 11/19/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFNA | 11/19/2024 | 8.40 ppt | 4.00 ppt | Detected |
| PFDoA | 11/19/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 11/19/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 11/19/2024 | 174.50 ppt | 4.00 ppt | Detected |
| PFOS | 11/19/2024 | 64.20 ppt | 4.00 ppt | Detected |
| PFHxA | 11/19/2024 | 59.10 ppt | 3.00 ppt | Detected |
| PFHxS | 11/19/2024 | 193.70 ppt | 3.00 ppt | Detected |
| PFHpA | 11/19/2024 | 48.00 ppt | 3.00 ppt | Detected |
| PFBS | 11/19/2024 | 4.60 ppt | 3.00 ppt | Detected |
| PFTrDA | 11/19/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| NMeFOSAA | 11/19/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| 9Cl-PF3ONS | 11/19/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 11/19/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 11/19/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeA | 11/19/2024 | 35.80 ppt | 3.00 ppt | Detected |
| 11Cl-PF3OUdS | 11/19/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpS | 11/19/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 11/19/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 11/19/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
Health-based violations on Potrero Elementary School
6 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for CA3700963.
Sources: EPA SDWIS · California State Water Resources Control Board, Division of Drinking Water
Nationwide peers
16 violations · 300 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.
What to do with Potrero Elementary School
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.