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Community Water System · PWS PR0003343

Lajas

Lajas, Puerto Rico 00667 - drinking water served from surface water sources to 47,531 people, tracked in EPA SDWIS and UCMR5.

47,531
People served
337
EPA violations
107
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 337 drinking-water violations at Lajas, 32% of them health-based - below the Puerto Rico per-system average.

337
Total EPA violations on record
32%
Health-based (MCL / treatment failure)
47,531
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Lajas

Lajas is a local-owned community water system that delivers drinking water to 47,531 residents in Lajas, Puerto Rico (Lajas Municipio County) through 17,802 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 337 total violations for this system , of which 107 (32%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 216 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is CARBON, TOTAL, recorded in 33 violations (TT, health-based). 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. Statewide, 40 of 99 UCMR5-tested systems have reported PFAS detections (40.4%).

Lajas's 337 violations sit below 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.

Population Served
47,531
Total Violations
337
Health-Based Violations
107
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
17,802
County
Lajas Municipio
School/Daycare
No
MCL Violations
54
Monitoring Violations
216
Treatment Tech Violations
53

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
CARBON, TOTAL TT 33 2011
TTHM MCL 28 2020
Coliform (TCR) MCL 20 2010
Total Haloacetic Acids (HAA5) MR 17 2019
TTHM MR 17 2019
Cryptosporidium MR 14 2017
Turbidity MR 12 2017
E. COLI MR 12 2017
Surface Water Treatment Rule TT 10 2000
Interim Enhanced Surface Water Treatment Rule TT 10 2020
Total Haloacetic Acids (HAA5) MCL 6 2010
Lead and Copper Rule MR 5 2016
Coliform (TCR) MR 4 2005
Consumer Confidence Rule Other 4 2020
DICHLOROMETHANE MR 4 2023
Vinyl chloride MR 4 2023
1,1-Dichloroethylene MR 4 2023
trans-1,2-Dichloroethylene MR 4 2023
Carbon tetrachloride MR 4 2023
1,1,2-Trichloroethane MR 4 2023
Tetrachloroethylene MR 4 2023
Benzene MR 4 2023
Toluene MR 4 2023
Ethylbenzene MR 4 2023
1,2,4-Trichlorobenzene MR 4 2023
o-Dichlorobenzene MR 4 2023
1,2-Dichloroethane MR 4 2023
1,2-Dichloropropane MR 4 2023
Trichloroethylene MR 4 2023
CHLOROBENZENE MR 4 2023

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 116 samples detected PFAS.

Contaminant Date Result MRL Status
PFOS 9/17/2025 <4.00 ppt 4.00 ppt Not Detected
ADONA 9/17/2025 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 9/17/2025 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 9/17/2025 <5.00 ppt 5.00 ppt Not Detected
PFUnA 9/17/2025 <2.00 ppt 2.00 ppt Not Detected
NMeFOSAA 9/17/2025 <6.00 ppt 6.00 ppt Not Detected
HFPO-DA 9/17/2025 <5.00 ppt 5.00 ppt Not Detected
PFOA 9/17/2025 <4.00 ppt 4.00 ppt Not Detected
PFHxA 9/17/2025 <3.00 ppt 3.00 ppt Not Detected
PFTA 9/17/2025 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 9/17/2025 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 9/17/2025 <5.00 ppt 5.00 ppt Not Detected
PFHpS 9/17/2025 <3.00 ppt 3.00 ppt Not Detected
PFDoA 9/17/2025 <3.00 ppt 3.00 ppt Not Detected
NFDHA 9/17/2025 <20.00 ppt 20.00 ppt Not Detected
PFDA 9/17/2025 <3.00 ppt 3.00 ppt Not Detected
PFPeS 9/17/2025 <4.00 ppt 4.00 ppt Not Detected
PFBA 9/17/2025 <5.00 ppt 5.00 ppt Not Detected
PFEESA 9/17/2025 <3.00 ppt 3.00 ppt Not Detected
PFMBA 9/17/2025 <3.00 ppt 3.00 ppt Not Detected
PFNA 9/17/2025 <4.00 ppt 4.00 ppt Not Detected
PFHxS 9/17/2025 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/17/2025 <3.00 ppt 3.00 ppt Not Detected
PFPeA 9/17/2025 <3.00 ppt 3.00 ppt Not Detected
PFMPA 9/17/2025 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 9/17/2025 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 9/17/2025 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 9/17/2025 <5.00 ppt 5.00 ppt Not Detected
PFHpA 9/17/2025 <3.00 ppt 3.00 ppt Not Detected
PFBA 6/11/2025 <5.00 ppt 5.00 ppt Not Detected
NFDHA 6/11/2025 <20.00 ppt 20.00 ppt Not Detected
PFEESA 6/11/2025 <3.00 ppt 3.00 ppt Not Detected
PFMBA 6/11/2025 <3.00 ppt 3.00 ppt Not Detected
PFPeA 6/11/2025 <3.00 ppt 3.00 ppt Not Detected
PFMPA 6/11/2025 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 6/11/2025 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 6/11/2025 <5.00 ppt 5.00 ppt Not Detected
PFPeS 6/11/2025 <4.00 ppt 4.00 ppt Not Detected
PFDoA 6/11/2025 <3.00 ppt 3.00 ppt Not Detected
PFBS 6/11/2025 <3.00 ppt 3.00 ppt Not Detected
4:2 FTS 6/11/2025 <3.00 ppt 3.00 ppt Not Detected
PFHxA 6/11/2025 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 6/11/2025 <6.00 ppt 6.00 ppt Not Detected
PFTrDA 6/11/2025 <7.00 ppt 7.00 ppt Not Detected
PFTA 6/11/2025 <8.00 ppt 8.00 ppt Not Detected
NEtFOSAA 6/11/2025 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 6/11/2025 <2.00 ppt 2.00 ppt Not Detected
PFOA 6/11/2025 <4.00 ppt 4.00 ppt Not Detected
PFUnA 6/11/2025 <2.00 ppt 2.00 ppt Not Detected
PFHpS 6/11/2025 <3.00 ppt 3.00 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 Lajas.

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 PR0003343 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
2023 DICHLOROMETHANE MR 4 SDWIS / PR0003343 / 2964
2023 Vinyl chloride MR 4 SDWIS / PR0003343 / 2976
2023 1,1-Dichloroethylene MR 4 SDWIS / PR0003343 / 2977
2023 trans-1,2-Dichloroethylene MR 4 SDWIS / PR0003343 / 2979
2023 Carbon tetrachloride MR 4 SDWIS / PR0003343 / 2982
2023 1,1,2-Trichloroethane MR 4 SDWIS / PR0003343 / 2985
2023 Tetrachloroethylene MR 4 SDWIS / PR0003343 / 2987
2023 Benzene MR 4 SDWIS / PR0003343 / 2990
2023 Toluene MR 4 SDWIS / PR0003343 / 2991
2023 Ethylbenzene MR 4 SDWIS / PR0003343 / 2992
2023 1,2,4-Trichlorobenzene MR 4 SDWIS / PR0003343 / 2378
2023 o-Dichlorobenzene MR 4 SDWIS / PR0003343 / 2968
2023 1,2-Dichloroethane MR 4 SDWIS / PR0003343 / 2980
2023 1,2-Dichloropropane MR 4 SDWIS / PR0003343 / 2983
2023 Trichloroethylene MR 4 SDWIS / PR0003343 / 2984

How Lajas Compares

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

Metric Lajas Puerto Rico avg Federal benchmark
Total violations 337 358.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 107 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 47,531 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 Lajas water safe to drink?
Lajas (PWS ID: PR0003343) has 337 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 47,531 people using Surface Water sources.
How many people does Lajas serve?
Lajas serves 47,531 people in Lajas, Puerto Rico. It is a Local-owned system using Surface Water water sources with 17,802 service connections.
What type of violations does Lajas have?
Lajas has 337 total violations: 107 health-based violations (MCL exceedances or treatment failures), 216 monitoring/reporting violations, and 53 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Lajas water?
No. Lajas was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Lajas use?
Lajas 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.
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.