Non-Transient Non-Community Water System · PWS PR0518085
Upr Cayey
Operator location Cayey, Puerto Rico - upper-third violation load (> 74 violations) with 399 EPA violations; groundwater source; 2,613 served (PWS-level, not municipal population).
- 2,613
- People served (this PWS)
- 399
- EPA violations (this PWS)
- 6
- Health-based (this PWS)
- 4 PFAS
- UCMR5 (this PWS)
Upr Cayey standing, high SDWIS violation third
399 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 2% is middle-third health share (≤ 23%). UCMR5: middle-third PFAS panel (≤ 4 compounds). Population rank #11,551 of 29,740 among systems serving 500+.
The verdict
Upr Cayey sits in the upper third of the sitemap cohort by violation count (399), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 2,613 (mid served population (≤ 3,309)). Health-based share is 2% (middle-third health share (≤ 23%)). UCMR5 detected 4 PFAS compounds (middle-third PFAS panel (≤ 4 compounds)).
- #11,551 of 29,740
- Population · /systems
- #111 of 235
- Population · PR
- 399
- Total EPA violations on record
- 2%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Private
- Connections
- 66
- County
- Cayey Municipio
- School/Daycare
- Yes
- MCL Violations
- 6
- Monitoring Violations
- 390
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 18 | 2015 |
| Lead and Copper Rule | MR | 15 | 2018 |
| Total Haloacetic Acids (HAA5) | MR | 13 | 2019 |
| TTHM | MR | 13 | 2019 |
| Picloram | MR | 13 | 2023 |
| Nitrate | MR | 10 | 2021 |
| Coliform (TCR) | MCL | 6 | 2011 |
| Endrin | MR | 6 | 2021 |
| Toxaphene | MR | 6 | 2021 |
| Dalapon | MR | 6 | 2021 |
| Endothall | MR | 6 | 2021 |
| Glyphosate | MR | 6 | 2021 |
| OXAMYL | MR | 6 | 2021 |
| Heptachlor | MR | 6 | 2021 |
| 2,4,5-TP | MR | 6 | 2021 |
| Pentachlorophenol | MR | 6 | 2021 |
| ETHYLENE DIBROMIDE | MR | 6 | 2021 |
| Chlordane | MR | 6 | 2021 |
| BHC-GAMMA | MR | 6 | 2021 |
| Dinoseb | MR | 6 | 2021 |
| Hexachlorocyclopentadiene | MR | 6 | 2021 |
| Carbofuran | MR | 6 | 2021 |
| LASSO | MR | 6 | 2021 |
| Heptachlor epoxide | MR | 6 | 2021 |
| HEXACHLOROBENZENE | MR | 6 | 2021 |
| Total Polychlorinated Biphenyls (PCB) | MR | 6 | 2021 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 6 | 2021 |
| Methoxychlor | MR | 6 | 2021 |
| Simazine | MR | 6 | 2021 |
| Atrazine | MR | 6 | 2021 |
Violation Count vs. the National Corpus
Upr Cayey has 399 recorded EPA violations, 94% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 6% carry more. 2% of this system's own violations are health-based (6 of 399), and it ranks #11,551 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)
399 Higher than most more violations than 94% 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. 8 of 58 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFOA | 6/20/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 6:2 FTS | 6/20/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 6/20/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 6/20/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 6/20/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 6/20/2023 | 5.20 ppt | 3.00 ppt | Detected |
| PFOS | 6/20/2023 | 13.20 ppt | 4.00 ppt | Detected |
| PFHxA | 6/20/2023 | 3.00 ppt | 3.00 ppt | Detected |
| PFDoA | 6/20/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 6/20/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| HFPO-DA | 6/20/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBS | 6/20/2023 | 5.20 ppt | 3.00 ppt | Detected |
| ADONA | 6/20/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 6/20/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFNA | 6/20/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 6/20/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 6/20/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 6/20/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 6/20/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 6/20/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 6/20/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 6/20/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 6/20/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 6/20/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 6/20/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 6/20/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| 9Cl-PF3ONS | 6/20/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFDA | 6/20/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 6/20/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFNA | 1/9/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 1/9/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 1/9/2024 | 4.80 ppt | 3.00 ppt | Detected |
| PFMPA | 1/9/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDoA | 1/9/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 1/9/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 1/9/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFOS | 1/9/2024 | 16.40 ppt | 4.00 ppt | Detected |
| PFPeS | 1/9/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpA | 1/9/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 1/9/2024 | 5.70 ppt | 3.00 ppt | Detected |
| PFOA | 1/9/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 1/9/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFTrDA | 1/9/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFHpS | 1/9/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 1/9/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 1/9/2024 | 3.00 ppt | 3.00 ppt | Detected |
| PFUnA | 1/9/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 1/9/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 1/9/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 1/9/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
SDWIS compliance record for Upr Cayey
399 violations on record for PR0518085; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS
Nationwide peers
399 violations · 2,613 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 Upr Cayey
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Puerto Rico compares on the same EPA violation measures. Puerto Rico 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.