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Community Water System · PWS PR0004545

Aibonito la Plata

Aibonito, Puerto Rico 00653 - drinking water served from surface water sources to 16,202 people, tracked in EPA SDWIS and UCMR5.

16,202
People served
1,302
EPA violations
136
Health-based
6 PFAS
UCMR5 result

The verdict

EPA records 1,302 drinking-water violations at Aibonito la Plata, 10% of them health-based - above the Puerto Rico per-system average, and UCMR5 testing detected 6 PFAS compounds.

1,302
Total EPA violations on record
10%
Health-based (MCL / treatment failure)
16,202
People served by this system
6
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Aibonito la Plata

Aibonito la Plata is a local-owned community water system that delivers drinking water to 16,202 residents in Aibonito, Puerto Rico (Aibonito Municipio County) through 6,068 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 1,302 total violations for this system , of which 136 (10%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 1,148 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is CARBON, TOTAL, recorded in 47 violations (TT, health-based). Under EPA's UCMR5 PFAS monitoring program, 6 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 46.7 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%).

Aibonito la Plata's 1,302 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

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

Population Served
16,202
Total Violations
1,302
Health-Based Violations
136
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
6,068
County
Aibonito Municipio
School/Daycare
No
MCL Violations
40
Monitoring Violations
1,148
Treatment Tech Violations
96

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
CARBON, TOTAL TT 47 2014
cis-1,2-Dichloroethylene MR 36 2017
o-Dichlorobenzene MR 36 2017
p-Dichlorobenzene MR 36 2017
Vinyl chloride MR 36 2017
1,2-Dichloroethane MR 36 2017
Carbon tetrachloride MR 36 2017
1,2-Dichloropropane MR 36 2017
1,1,2-Trichloroethane MR 36 2017
Tetrachloroethylene MR 36 2017
CHLOROBENZENE MR 36 2017
Toluene MR 36 2017
Styrene MR 36 2017
1,2,4-Trichlorobenzene MR 36 2017
1,1-Dichloroethylene MR 36 2017
1,1,1-Trichloroethane MR 36 2017
Benzene MR 36 2017
Xylenes, Total MR 36 2017
DICHLOROMETHANE MR 36 2017
Trichloroethylene MR 36 2017
Ethylbenzene MR 36 2017
trans-1,2-Dichloroethylene MR 36 2017
Surface Water Treatment Rule TT 27 2001
Interim Enhanced Surface Water Treatment Rule TT 22 2016
Coliform (TCR) MCL 19 2015
TTHM MCL 18 2020
Heptachlor MR 13 2024
Endrin MR 12 2024
Methoxychlor MR 12 2024
Toxaphene MR 12 2024

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 18 of 290 samples detected PFAS.

Contaminant Date Result MRL Status
PFHpA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFOS 9/20/2023 46.70 ppt 4.00 ppt Detected
PFHxS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFMBA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 9/20/2023 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFTA 9/20/2023 <8.00 ppt 8.00 ppt Not Detected
8:2 FTS 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 9/20/2023 <7.00 ppt 7.00 ppt Not Detected
PFDoA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 9/20/2023 <20.00 ppt 20.00 ppt Not Detected
PFEESA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFBA 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFHxA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 9/20/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 9/20/2023 <2.00 ppt 2.00 ppt Not Detected
HFPO-DA 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
6:2 FTS 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
ADONA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFDoA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFEESA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 9/20/2023 <20.00 ppt 20.00 ppt Not Detected
PFBS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 9/20/2023 <8.00 ppt 8.00 ppt Not Detected
PFOS 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFNA 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
9Cl-PF3ONS 9/20/2023 <2.00 ppt 2.00 ppt Not Detected
PFDA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
ADONA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 9/20/2023 <2.00 ppt 2.00 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 Aibonito la Plata.

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 PR0004545 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
2024 Heptachlor MR 13 SDWIS / PR0004545 / 2065
2024 Endrin MR 12 SDWIS / PR0004545 / 2005
2024 Methoxychlor MR 12 SDWIS / PR0004545 / 2015
2024 Toxaphene MR 12 SDWIS / PR0004545 / 2020
2024 Total Polychlorinated Biphenyls (PCB) MR 12 SDWIS / PR0004545 / 2383
2024 Chlordane MR 12 SDWIS / PR0004545 / 2959
2024 Heptachlor epoxide MR 12 SDWIS / PR0004545 / 2067
2024 HEXACHLOROBENZENE MR 12 SDWIS / PR0004545 / 2274
2024 BHC-GAMMA MR 12 SDWIS / PR0004545 / 2010
2024 Endothall MR 11 SDWIS / PR0004545 / 2033
2024 Diquat MR 11 SDWIS / PR0004545 / 2032
2024 Hexachlorocyclopentadiene MR 11 SDWIS / PR0004545 / 2042
2024 2,4-D MR 10 SDWIS / PR0004545 / 2105
2024 Atrazine MR 10 SDWIS / PR0004545 / 2050
2024 Benzo(a)pyrene MR 10 SDWIS / PR0004545 / 2306

How Aibonito la Plata Compares

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

Metric Aibonito la Plata Puerto Rico avg Federal benchmark
Total violations 1,302 358.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 136 75.7 Indicates a contaminant exceeded a federal MCL
PFAS detection 6 compounds 40.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 16,202 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 Aibonito la Plata water safe to drink? ▼
Aibonito la Plata (PWS ID: PR0004545) has 1302 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 6 PFAS compounds found. This system serves 16,202 people using Surface Water sources.
How many people does Aibonito la Plata serve? ▼
Aibonito la Plata serves 16,202 people in Aibonito, Puerto Rico. It is a Local-owned system using Surface Water water sources with 6,068 service connections.
What type of violations does Aibonito la Plata have? ▼
Aibonito la Plata has 1,302 total violations: 136 health-based violations (MCL exceedances or treatment failures), 1,148 monitoring/reporting violations, and 96 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Aibonito la Plata water? ▼
Yes. UCMR5 testing detected 6 PFAS compounds in Aibonito la Plata's water supply: PFOS, PFHxA, PFHxS, PFPeA, PFBA, and others. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Aibonito la Plata use? ▼
Aibonito la Plata 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.