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Community Water System · PWS PR0004835

Patillas Urbano

Patillas, Puerto Rico 00723 - drinking water served from surface water sources to 31,955 people, tracked in EPA SDWIS and UCMR5.

31,955
People served
930
EPA violations
57
Health-based
4 PFAS
UCMR5 result

The verdict

EPA records 930 drinking-water violations at Patillas Urbano, 6% of them health-based - above the Puerto Rico per-system average, and UCMR5 testing detected 4 PFAS compounds.

930
Total EPA violations on record
6%
Health-based (MCL / treatment failure)
31,955
People served by this system
4
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Patillas Urbano

Patillas Urbano is a local-owned community water system that delivers drinking water to 31,955 residents in Patillas, Puerto Rico (Patillas Municipio County) through 11,968 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 930 total violations for this system , of which 57 (6%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 857 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.

The most frequently cited contaminant at this system is Glyphosate, recorded in 24 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 4 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 28.6 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across Puerto Rico, EPA tracks 458 public water systems serving 3,328,141 people, with 164,144 cumulative violations and 34,657 health-based violations on record. About 100% of systems in the state carry at least one violation, and state-wide the average per system is 358.4 violations. Statewide, 40 of 99 UCMR5-tested systems have reported PFAS detections (40.4%).

Patillas Urbano's 930 violations sit above the Puerto Rico average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

PFAS Detected

4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
31,955
Total Violations
930
Health-Based Violations
57
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
11,968
County
Patillas Municipio
School/Daycare
No
MCL Violations
39
Monitoring Violations
857
Treatment Tech Violations
18

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Glyphosate MR 24 2019
Di(2-ethylhexyl) phthalate MR 22 2018
Endrin MR 21 2018
BHC-GAMMA MR 21 2018
Methoxychlor MR 21 2018
Toxaphene MR 21 2018
Dalapon MR 21 2018
Diquat MR 21 2018
OXAMYL MR 21 2018
Simazine MR 21 2018
Picloram MR 21 2018
Hexachlorocyclopentadiene MR 21 2018
Carbofuran MR 21 2018
Heptachlor epoxide MR 21 2018
2,4-D MR 21 2018
2,4,5-TP MR 21 2018
HEXACHLOROBENZENE MR 21 2018
Benzo(a)pyrene MR 21 2018
Pentachlorophenol MR 21 2018
Total Polychlorinated Biphenyls (PCB) MR 21 2018
ETHYLENE DIBROMIDE MR 21 2019
Heptachlor MR 21 2018
Chlordane MR 21 2018
Dinoseb MR 21 2018
Atrazine MR 21 2018
Endothall MR 21 2018
LASSO MR 21 2018
Di(2-ethylhexyl) adipate MR 21 2018
1,2-DIBROMO-3-CHLOROPROPANE MR 21 2019
Cryptosporidium MR 20 2019

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 8 of 406 samples detected PFAS.

Contaminant Date Result MRL Status
PFTA 7/15/2024 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 7/15/2024 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 7/15/2024 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 7/15/2024 <6.00 ppt 6.00 ppt Not Detected
PFBS 7/15/2024 <3.00 ppt 3.00 ppt Not Detected
PFHpA 7/15/2024 <3.00 ppt 3.00 ppt Not Detected
PFHxS 7/15/2024 <3.00 ppt 3.00 ppt Not Detected
PFNA 7/15/2024 <4.00 ppt 4.00 ppt Not Detected
PFOS 7/15/2024 <4.00 ppt 4.00 ppt Not Detected
PFOA 7/15/2024 <4.00 ppt 4.00 ppt Not Detected
PFDA 7/15/2024 <3.00 ppt 3.00 ppt Not Detected
PFDoA 7/15/2024 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 7/15/2024 <5.00 ppt 5.00 ppt Not Detected
PFUnA 7/15/2024 <2.00 ppt 2.00 ppt Not Detected
ADONA 7/15/2024 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 7/15/2024 <5.00 ppt 5.00 ppt Not Detected
PFBA 7/15/2024 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 7/15/2024 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 7/15/2024 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 7/15/2024 <5.00 ppt 5.00 ppt Not Detected
PFMPA 7/15/2024 <4.00 ppt 4.00 ppt Not Detected
PFPeA 7/15/2024 <3.00 ppt 3.00 ppt Not Detected
PFMBA 7/15/2024 <3.00 ppt 3.00 ppt Not Detected
PFEESA 7/15/2024 <3.00 ppt 3.00 ppt Not Detected
NFDHA 7/15/2024 <20.00 ppt 20.00 ppt Not Detected
PFPeS 7/15/2024 <4.00 ppt 4.00 ppt Not Detected
PFHpS 7/15/2024 <3.00 ppt 3.00 ppt Not Detected
PFHxA 7/15/2024 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 7/15/2024 <2.00 ppt 2.00 ppt Not Detected
PFPeA 4/30/2024 <3.00 ppt 3.00 ppt Not Detected
PFHxA 4/30/2024 <3.00 ppt 3.00 ppt Not Detected
PFDoA 4/30/2024 <3.00 ppt 3.00 ppt Not Detected
PFDA 4/30/2024 <3.00 ppt 3.00 ppt Not Detected
PFOA 4/30/2024 <4.00 ppt 4.00 ppt Not Detected
PFOS 4/30/2024 <4.00 ppt 4.00 ppt Not Detected
PFNA 4/30/2024 <4.00 ppt 4.00 ppt Not Detected
PFHxS 4/30/2024 <3.00 ppt 3.00 ppt Not Detected
PFTrDA 4/30/2024 <7.00 ppt 7.00 ppt Not Detected
PFBS 4/30/2024 <3.00 ppt 3.00 ppt Not Detected
PFUnA 4/30/2024 <2.00 ppt 2.00 ppt Not Detected
PFMPA 4/30/2024 <4.00 ppt 4.00 ppt Not Detected
PFHpA 4/30/2024 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 4/30/2024 <6.00 ppt 6.00 ppt Not Detected
PFTA 4/30/2024 <8.00 ppt 8.00 ppt Not Detected
PFHpS 4/30/2024 <3.00 ppt 3.00 ppt Not Detected
PFPeS 4/30/2024 <4.00 ppt 4.00 ppt Not Detected
NFDHA 4/30/2024 <20.00 ppt 20.00 ppt Not Detected
4:2 FTS 4/30/2024 <3.00 ppt 3.00 ppt Not Detected
PFMBA 4/30/2024 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 4/30/2024 <5.00 ppt 5.00 ppt Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Patillas Urbano.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID PR0004835 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Puerto Rico Drinking Water Authority

Puerto Rico's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find PR regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2020 TTHM MCL 15 SDWIS / PR0004835 / 2950
2020 Consumer Confidence Rule Other 4 SDWIS / PR0004835 / 7000
2019 Glyphosate MR 24 SDWIS / PR0004835 / 2034
2019 ETHYLENE DIBROMIDE MR 21 SDWIS / PR0004835 / 2946
2019 1,2-DIBROMO-3-CHLOROPROPANE MR 21 SDWIS / PR0004835 / 2931
2019 Cryptosporidium MR 20 SDWIS / PR0004835 / 3015
2019 Turbidity MR 17 SDWIS / PR0004835 / 0100
2019 E. COLI MR 17 SDWIS / PR0004835 / 3014
2019 Total Haloacetic Acids (HAA5) MCL 8 SDWIS / PR0004835 / 2456
2019 Total Haloacetic Acids (HAA5) MR 6 SDWIS / PR0004835 / 2456
2019 Public Notice Other 2 SDWIS / PR0004835 / 7500
2019 Revised Total Coliform Rule MCL 1 SDWIS / PR0004835 / 8000
2018 Di(2-ethylhexyl) phthalate MR 22 SDWIS / PR0004835 / 2039
2018 Endrin MR 21 SDWIS / PR0004835 / 2005
2018 BHC-GAMMA MR 21 SDWIS / PR0004835 / 2010

How Patillas Urbano Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Patillas Urbano Puerto Rico avg Federal benchmark
Total violations 930 358.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 57 75.7 Indicates a contaminant exceeded a federal MCL
PFAS detection 4 compounds 40.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 31,955 7,267 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 458 regulated public water systems in Puerto Rico.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Patillas Urbano water safe to drink? ▼
Patillas Urbano (PWS ID: PR0004835) has 930 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 4 PFAS compounds found. This system serves 31,955 people using Surface Water sources.
How many people does Patillas Urbano serve? ▼
Patillas Urbano serves 31,955 people in Patillas, Puerto Rico. It is a Local-owned system using Surface Water water sources with 11,968 service connections.
What type of violations does Patillas Urbano have? ▼
Patillas Urbano has 930 total violations: 57 health-based violations (MCL exceedances or treatment failures), 857 monitoring/reporting violations, and 18 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Patillas Urbano water? ▼
Yes. UCMR5 testing detected 4 PFAS compounds in Patillas Urbano's water supply: PFBS, PFOS, PFDA, 6:2 FTS. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Patillas Urbano use? ▼
Patillas Urbano uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.