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) Middle third of systems
- 399
- EPA violations (this PWS) Upper third of systems
- 6
- Health-based (this PWS) Middle third by health-based share
- 4 PFAS
- UCMR5 (this PWS) Middle third of PFAS-detected systems
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.
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
- 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
How many violations vs. how serious, among peer systems
Upr Cayey 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. 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.
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.