PlainWater
States → Puerto Rico

DUEY

PWS ID: PR0004234 · YAUCO, Puerto Rico 00698

DUEY serves 2,368 people in YAUCO, Puerto Rico using Surface Water water sources. It has 216 recorded EPA violations, including 30 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: DUEY

DUEY is a local-owned community water system that delivers drinking water to 2,368 residents in YAUCO, Puerto Rico (Maricao Municipio County) through 887 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 216 total violations for this system , of which 30 (14%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 154 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 42 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

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. DUEY's 216 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
2,368
Total Violations
216
Health-Based Violations
30
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
887
County
Maricao Municipio
School/Daycare
No
MCL Violations
12
Monitoring Violations
154
Treatment Tech Violations
18

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 42 2016
Total Haloacetic Acids (HAA5) MCL 12 2018
Surface Water Treatment Rule TT 11 2005
Long Term 2 Enhanced Surface Water Treatment Rule TT 6 2025
Consumer Confidence Rule Other 5 2022
Coliform (TCR) MR 4 1999
E. COLI MR 4 2018
OXAMYL MR 3 2014
Carbofuran MR 3 2014
BHC-GAMMA MR 2 2014
Methoxychlor MR 2 2014
Toxaphene MR 2 2014
Dalapon MR 2 2014
Diquat MR 2 2014
Endothall MR 2 2014
Di(2-ethylhexyl) adipate MR 2 2014
Atrazine MR 2 2014
LASSO MR 2 2014
Heptachlor MR 2 2014
2,4-D MR 2 2014
2,4,5-TP MR 2 2014
HEXACHLOROBENZENE MR 2 2014
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2014
ETHYLENE DIBROMIDE MR 2 2014
Chlordane MR 2 2014
Arsenic MR 2 1984
Nitrate MR 2 1984
Mercury MR 2 1984
Fluoride MR 2 1984
Cadmium MR 2 1984

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 DUEY.

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 PR0004234 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
2025 Long Term 2 Enhanced Surface Water Treatment Rule TT 6 SDWIS / PR0004234 / 0800
2024 Public Notice Other 1 SDWIS / PR0004234 / 7500
2022 Consumer Confidence Rule Other 5 SDWIS / PR0004234 / 7000
2018 Total Haloacetic Acids (HAA5) MCL 12 SDWIS / PR0004234 / 2456
2018 E. COLI MR 4 SDWIS / PR0004234 / 3014
2016 Lead and Copper Rule MR 42 SDWIS / PR0004234 / 5000
2016 Surface Water Treatment Rule MR 2 SDWIS / PR0004234 / 0200
2014 OXAMYL MR 3 SDWIS / PR0004234 / 2036
2014 Carbofuran MR 3 SDWIS / PR0004234 / 2046
2014 BHC-GAMMA MR 2 SDWIS / PR0004234 / 2010
2014 Methoxychlor MR 2 SDWIS / PR0004234 / 2015
2014 Toxaphene MR 2 SDWIS / PR0004234 / 2020
2014 Dalapon MR 2 SDWIS / PR0004234 / 2031
2014 Diquat MR 2 SDWIS / PR0004234 / 2032
2014 Endothall MR 2 SDWIS / PR0004234 / 2033

How DUEY Compares

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

Metric DUEY Puerto Rico avg Federal benchmark
Total violations 216 358.4 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 30 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 2,368 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 DUEY water safe to drink? ▼
DUEY (PWS ID: PR0004234) has 216 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,368 people using Surface Water sources.
How many people does DUEY serve? ▼
DUEY serves 2,368 people in YAUCO, Puerto Rico. It is a Local-owned system using Surface Water water sources with 887 service connections.
What type of violations does DUEY have? ▼
DUEY has 216 total violations: 30 health-based violations (MCL exceedances or treatment failures), 154 monitoring/reporting violations, and 18 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in DUEY water? ▼
No PFAS testing data is available for DUEY under the EPA's UCMR5 monitoring program.
What water source does DUEY use? ▼
DUEY 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.

Explore PlainWater

Water in Puerto Rico

All systems in state
All States

Water quality by state
Contaminants

PFAS & other pollutants
Guides

Understanding water quality

Related Data for Puerto Rico

Environmental Data → Natural Hazards → Air Quality → Healthcare Access → Climate Data →
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

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

Related

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