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) Smaller third of systems
- 16
- EPA violations (this PWS) Lower third of systems
- 6
- Health-based (this PWS) Upper third by health-based share
- 9 PFAS
- UCMR5 (this PWS) Upper third of PFAS-detected systems
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.
Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.
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
How many violations vs. how serious, among peer systems
Potrero Elementary School plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.
Violation volume vs. health-based share
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.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.