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GUAYANILLA URBANO

PWS ID: PR0004054 · GUAYANILLA, Puerto Rico 00656

GUAYANILLA URBANO serves 7,986 people in GUAYANILLA, Puerto Rico using Groundwater water sources. It has 301 recorded EPA violations, including 4 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: GUAYANILLA URBANO

GUAYANILLA URBANO is a local-owned community water system that delivers drinking water to 7,986 residents in GUAYANILLA, Puerto Rico (Guayanilla Municipio County) through 2,991 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 301 total violations for this system , of which 4 (1%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 284 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 Mercury, recorded in 8 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

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. GUAYANILLA URBANO's 301 violations sit below the Puerto Rico average. Statewide, 40 of 99 UCMR5-tested systems have reported PFAS detections (40.4%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
7,986
Total Violations
301
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
2,991
County
Guayanilla Municipio
School/Daycare
No
MCL Violations
4
Monitoring Violations
284
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Mercury MR 8 2010
1,2,4-Trichlorobenzene MR 6 2015
o-Dichlorobenzene MR 6 2015
p-Dichlorobenzene MR 6 2015
Vinyl chloride MR 6 2015
1,1-Dichloroethylene MR 6 2015
Carbon tetrachloride MR 6 2015
1,2-Dichloropropane MR 6 2015
1,1,2-Trichloroethane MR 6 2015
Tetrachloroethylene MR 6 2015
Benzene MR 6 2015
Ethylbenzene MR 6 2015
Styrene MR 6 2015
cis-1,2-Dichloroethylene MR 6 2015
Xylenes, Total MR 6 2015
DICHLOROMETHANE MR 6 2015
trans-1,2-Dichloroethylene MR 6 2015
Trichloroethylene MR 6 2015
CHLOROBENZENE MR 6 2015
Toluene MR 6 2015
1,2-Dichloroethane MR 6 2015
1,1,1-Trichloroethane MR 6 2015
Lead and Copper Rule MR 5 2016
Di(2-ethylhexyl) phthalate MR 5 2012
1,2-DIBROMO-3-CHLOROPROPANE MR 5 2012
ETHYLENE DIBROMIDE MR 5 2012
Endothall MR 5 2019
Di(2-ethylhexyl) adipate MR 5 2012
Benzo(a)pyrene MR 5 2012
Coliform (TCR) MCL 4 2005

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 90 samples detected PFAS.

Contaminant Date Result MRL Status
NMeFOSAA 6/17/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFPeA 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 6/17/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 6/17/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 6/17/2025 <0.008 µg/L 0.008 µg/L Not Detected
NEtFOSAA 6/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
lithium 6/17/2025 <9 µg/L 9 µg/L Not Detected
8:2 FTS 6/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 6/17/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFTrDA 6/17/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFDA 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 6/17/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 6/17/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFDoA 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 6/17/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFBA 6/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
11Cl-PF3OUdS 6/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 6/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 6/17/2025 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 6/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 6/17/2025 <0.004 µg/L 0.004 µg/L Not Detected
NMeFOSAA 6/17/2025 <0.006 µg/L 0.006 µg/L Not Detected
4:2 FTS 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 6/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 6/17/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 6/17/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFHpS 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 6/17/2025 <0.008 µg/L 0.008 µg/L Not Detected
NEtFOSAA 6/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
lithium 6/17/2025 <9 µg/L 9 µg/L Not Detected
6:2 FTS 6/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFEESA 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 6/17/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFHpA 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 6/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFPeS 6/17/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFBS 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 6/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 6/17/2025 <0.004 µg/L 0.004 µg/L 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 GUAYANILLA 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 PR0004054 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 Consumer Confidence Rule Other 4 SDWIS / PR0004054 / 7000
2019 Endothall MR 5 SDWIS / PR0004054 / 2033
2016 Lead and Copper Rule MR 5 SDWIS / PR0004054 / 5000
2015 1,2,4-Trichlorobenzene MR 6 SDWIS / PR0004054 / 2378
2015 o-Dichlorobenzene MR 6 SDWIS / PR0004054 / 2968
2015 p-Dichlorobenzene MR 6 SDWIS / PR0004054 / 2969
2015 Vinyl chloride MR 6 SDWIS / PR0004054 / 2976
2015 1,1-Dichloroethylene MR 6 SDWIS / PR0004054 / 2977
2015 Carbon tetrachloride MR 6 SDWIS / PR0004054 / 2982
2015 1,2-Dichloropropane MR 6 SDWIS / PR0004054 / 2983
2015 1,1,2-Trichloroethane MR 6 SDWIS / PR0004054 / 2985
2015 Tetrachloroethylene MR 6 SDWIS / PR0004054 / 2987
2015 Benzene MR 6 SDWIS / PR0004054 / 2990
2015 Ethylbenzene MR 6 SDWIS / PR0004054 / 2992
2015 Styrene MR 6 SDWIS / PR0004054 / 2996

How GUAYANILLA URBANO Compares

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

Metric GUAYANILLA URBANO Puerto Rico avg Federal benchmark
Total violations 301 358.4 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 4 75.7 Indicates a contaminant exceeded a federal MCL
PFAS detection None 40.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 7,986 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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is GUAYANILLA URBANO water safe to drink? ▼
GUAYANILLA URBANO (PWS ID: PR0004054) has 301 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 7,986 people using Groundwater sources.
How many people does GUAYANILLA URBANO serve? ▼
GUAYANILLA URBANO serves 7,986 people in GUAYANILLA, Puerto Rico. It is a Local-owned system using Groundwater water sources with 2,991 service connections.
What type of violations does GUAYANILLA URBANO have? ▼
GUAYANILLA URBANO has 301 total violations: 4 health-based violations (MCL exceedances or treatment failures), 284 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in GUAYANILLA URBANO water? ▼
No. GUAYANILLA URBANO was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does GUAYANILLA URBANO use? ▼
GUAYANILLA URBANO uses Groundwater 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.

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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.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial