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Community Water System · PWS PR0004314

Yauco

Yauco, Puerto Rico 00698 - drinking water served from surface water sources to 35,618 people, tracked in EPA SDWIS and UCMR5.

35,618
People served
300
EPA violations
34
Health-based
2 PFAS
UCMR5 result

The verdict

EPA records 300 drinking-water violations at Yauco, 11% of them health-based - below the Puerto Rico per-system average, and UCMR5 testing detected 2 PFAS compounds.

300
Total EPA violations on record
11%
Health-based (MCL / treatment failure)
35,618
People served by this system
2
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Yauco

Yauco is a local-owned community water system that delivers drinking water to 35,618 residents in Yauco, Puerto Rico (Yauco Municipio County) through 13,340 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 300 total violations for this system , of which 34 (11%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 250 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 Cryptosporidium, recorded in 33 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 2 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 12.2 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%).

Yauco's 300 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.

PFAS Detected

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

Population Served
35,618
Total Violations
300
Health-Based Violations
34
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
13,340
County
Yauco Municipio
School/Daycare
No
MCL Violations
24
Monitoring Violations
250
Treatment Tech Violations
10

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Cryptosporidium MR 33 2019
E. COLI MR 31 2019
Turbidity MR 31 2019
TTHM MCL 13 2020
Coliform (TCR) MCL 11 2011
Total Haloacetic Acids (HAA5) MR 6 2014
BHC-GAMMA MR 6 2019
Hexachlorocyclopentadiene MR 6 2019
Heptachlor MR 6 2019
HEXACHLOROBENZENE MR 6 2019
Toxaphene MR 6 2019
Heptachlor epoxide MR 6 2019
Chlordane MR 6 2019
Endrin MR 6 2019
Methoxychlor MR 6 2019
Benzo(a)pyrene MR 5 2019
Di(2-ethylhexyl) adipate MR 5 2019
Lead and Copper Rule MR 5 2016
Surface Water Treatment Rule TT 4 1999
CARBON, TOTAL TT 4 2004
TTHM MR 4 2014
Simazine MR 4 2019
LASSO MR 4 2019
Total Polychlorinated Biphenyls (PCB) MR 4 2019
Consumer Confidence Rule Other 4 2020
Atrazine MR 4 2019
Arsenic MR 3 2007
Barium MR 3 2007
Mercury MR 3 2007
Glyphosate MR 3 2019

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 174 samples detected PFAS.

Contaminant Date Result MRL Status
PFUnA 7/24/2024 <2.00 ppt 2.00 ppt Not Detected
PFDoA 7/24/2024 <3.00 ppt 3.00 ppt Not Detected
4:2 FTS 7/24/2024 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 7/24/2024 <5.00 ppt 5.00 ppt Not Detected
PFBA 7/24/2024 12.20 ppt 5.00 ppt Detected
HFPO-DA 7/24/2024 <5.00 ppt 5.00 ppt Not Detected
ADONA 7/24/2024 <3.00 ppt 3.00 ppt Not Detected
PFHpA 7/24/2024 <3.00 ppt 3.00 ppt Not Detected
PFHxA 7/24/2024 <3.00 ppt 3.00 ppt Not Detected
PFPeA 7/24/2024 3.40 ppt 3.00 ppt Detected
PFDA 7/24/2024 <3.00 ppt 3.00 ppt Not Detected
PFOA 7/24/2024 <4.00 ppt 4.00 ppt Not Detected
PFOS 7/24/2024 <4.00 ppt 4.00 ppt Not Detected
PFNA 7/24/2024 <4.00 ppt 4.00 ppt Not Detected
PFHxS 7/24/2024 <3.00 ppt 3.00 ppt Not Detected
PFBS 7/24/2024 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 7/24/2024 <5.00 ppt 5.00 ppt Not Detected
PFMBA 7/24/2024 <3.00 ppt 3.00 ppt Not Detected
PFEESA 7/24/2024 <3.00 ppt 3.00 ppt Not Detected
NFDHA 7/24/2024 <20.00 ppt 20.00 ppt Not Detected
PFPeS 7/24/2024 <4.00 ppt 4.00 ppt Not Detected
PFHpS 7/24/2024 <3.00 ppt 3.00 ppt Not Detected
PFMPA 7/24/2024 <4.00 ppt 4.00 ppt Not Detected
PFTA 7/24/2024 <8.00 ppt 8.00 ppt Not Detected
8:2 FTS 7/24/2024 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 7/24/2024 <2.00 ppt 2.00 ppt Not Detected
NMeFOSAA 7/24/2024 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 7/24/2024 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 7/24/2024 <7.00 ppt 7.00 ppt Not Detected
NFDHA 7/11/2024 <20.00 ppt 20.00 ppt Not Detected
PFPeA 7/11/2024 <3.00 ppt 3.00 ppt Not Detected
PFMBA 7/11/2024 <3.00 ppt 3.00 ppt Not Detected
PFMPA 7/11/2024 <4.00 ppt 4.00 ppt Not Detected
PFPeS 7/11/2024 <4.00 ppt 4.00 ppt Not Detected
PFHpS 7/11/2024 <3.00 ppt 3.00 ppt Not Detected
PFOA 7/11/2024 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 7/11/2024 <5.00 ppt 5.00 ppt Not Detected
PFBS 7/11/2024 <3.00 ppt 3.00 ppt Not Detected
ADONA 7/11/2024 <3.00 ppt 3.00 ppt Not Detected
PFHpA 7/11/2024 <3.00 ppt 3.00 ppt Not Detected
PFHxS 7/11/2024 <3.00 ppt 3.00 ppt Not Detected
PFNA 7/11/2024 <4.00 ppt 4.00 ppt Not Detected
NMeFOSAA 7/11/2024 <6.00 ppt 6.00 ppt Not Detected
PFUnA 7/11/2024 <2.00 ppt 2.00 ppt Not Detected
NEtFOSAA 7/11/2024 <5.00 ppt 5.00 ppt Not Detected
PFEESA 7/11/2024 <3.00 ppt 3.00 ppt Not Detected
PFOS 7/11/2024 <4.00 ppt 4.00 ppt Not Detected
PFTA 7/11/2024 <8.00 ppt 8.00 ppt Not Detected
PFBA 7/11/2024 <5.00 ppt 5.00 ppt Not Detected
PFHxA 7/11/2024 <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 Yauco.

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 PR0004314 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 13 SDWIS / PR0004314 / 2950
2020 Consumer Confidence Rule Other 4 SDWIS / PR0004314 / 7000
2019 Cryptosporidium MR 33 SDWIS / PR0004314 / 3015
2019 E. COLI MR 31 SDWIS / PR0004314 / 3014
2019 Turbidity MR 31 SDWIS / PR0004314 / 0100
2019 BHC-GAMMA MR 6 SDWIS / PR0004314 / 2010
2019 Hexachlorocyclopentadiene MR 6 SDWIS / PR0004314 / 2042
2019 Heptachlor MR 6 SDWIS / PR0004314 / 2065
2019 HEXACHLOROBENZENE MR 6 SDWIS / PR0004314 / 2274
2019 Toxaphene MR 6 SDWIS / PR0004314 / 2020
2019 Heptachlor epoxide MR 6 SDWIS / PR0004314 / 2067
2019 Chlordane MR 6 SDWIS / PR0004314 / 2959
2019 Endrin MR 6 SDWIS / PR0004314 / 2005
2019 Methoxychlor MR 6 SDWIS / PR0004314 / 2015
2019 Benzo(a)pyrene MR 5 SDWIS / PR0004314 / 2306

How Yauco Compares

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

Metric Yauco Puerto Rico avg Federal benchmark
Total violations 300 358.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 34 75.7 Indicates a contaminant exceeded a federal MCL
PFAS detection 2 compounds 40.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 35,618 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 Yauco water safe to drink?
Yauco (PWS ID: PR0004314) has 300 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 2 PFAS compounds found. This system serves 35,618 people using Surface Water sources.
How many people does Yauco serve?
Yauco serves 35,618 people in Yauco, Puerto Rico. It is a Local-owned system using Surface Water water sources with 13,340 service connections.
What type of violations does Yauco have?
Yauco has 300 total violations: 34 health-based violations (MCL exceedances or treatment failures), 250 monitoring/reporting violations, and 10 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Yauco water?
Yes. UCMR5 testing detected 2 PFAS compounds in Yauco's water supply: PFBA, PFPeA. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Yauco use?
Yauco 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.