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CUYON

PWS ID: PR0004555 · AIBONITO, Puerto Rico 00653

CUYON serves 515 people in AIBONITO, Puerto Rico using Groundwater water sources. It has 121 recorded EPA violations, including 0 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: CUYON

CUYON is a local-owned community water system that delivers drinking water to 515 residents in AIBONITO, Puerto Rico (Aibonito Municipio County) through 193 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 121 total violations for this system , of which 0 (0%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 109 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 8 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. CUYON's 121 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
515
Total Violations
121
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
193
County
Aibonito Municipio
School/Daycare
No
MCL Violations
0
Monitoring Violations
109
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 8 2016
Consumer Confidence Rule Other 5 2022
Coliform (TCR) MR 4 2015
Endrin MR 4 2022
BHC-GAMMA MR 4 2022
Methoxychlor MR 4 2022
Toxaphene MR 4 2022
Heptachlor MR 4 2022
Heptachlor epoxide MR 4 2022
HEXACHLOROBENZENE MR 4 2022
Total Polychlorinated Biphenyls (PCB) MR 4 2022
Chlordane MR 4 2022
1,2-DIBROMO-3-CHLOROPROPANE MR 3 2022
Barium MR 3 2007
ETHYLENE DIBROMIDE MR 3 2022
Dalapon MR 2 2022
Glyphosate MR 2 2022
Di(2-ethylhexyl) adipate MR 2 2022
OXAMYL MR 2 2022
Picloram MR 2 2022
Dinoseb MR 2 2022
Hexachlorocyclopentadiene MR 2 2022
Carbofuran MR 2 2022
Atrazine MR 2 2022
LASSO MR 2 2022
2,4-D MR 2 2022
Benzo(a)pyrene MR 2 2022
Pentachlorophenol MR 2 2022
Nitrate MR 2 1984
Mercury 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 CUYON.

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 PR0004555 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
2022 Consumer Confidence Rule Other 5 SDWIS / PR0004555 / 7000
2022 Endrin MR 4 SDWIS / PR0004555 / 2005
2022 BHC-GAMMA MR 4 SDWIS / PR0004555 / 2010
2022 Methoxychlor MR 4 SDWIS / PR0004555 / 2015
2022 Toxaphene MR 4 SDWIS / PR0004555 / 2020
2022 Heptachlor MR 4 SDWIS / PR0004555 / 2065
2022 Heptachlor epoxide MR 4 SDWIS / PR0004555 / 2067
2022 HEXACHLOROBENZENE MR 4 SDWIS / PR0004555 / 2274
2022 Total Polychlorinated Biphenyls (PCB) MR 4 SDWIS / PR0004555 / 2383
2022 Chlordane MR 4 SDWIS / PR0004555 / 2959
2022 1,2-DIBROMO-3-CHLOROPROPANE MR 3 SDWIS / PR0004555 / 2931
2022 ETHYLENE DIBROMIDE MR 3 SDWIS / PR0004555 / 2946
2022 Dalapon MR 2 SDWIS / PR0004555 / 2031
2022 Glyphosate MR 2 SDWIS / PR0004555 / 2034
2022 Di(2-ethylhexyl) adipate MR 2 SDWIS / PR0004555 / 2035

How CUYON Compares

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

Metric CUYON Puerto Rico avg Federal benchmark
Total violations 121 358.4 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 0 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 515 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 CUYON water safe to drink? ▼
CUYON (PWS ID: PR0004555) has 121 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 515 people using Groundwater sources.
How many people does CUYON serve? ▼
CUYON serves 515 people in AIBONITO, Puerto Rico. It is a Local-owned system using Groundwater water sources with 193 service connections.
What type of violations does CUYON have? ▼
CUYON has 121 total violations: 0 health-based violations (MCL exceedances or treatment failures), 109 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in CUYON water? ▼
No PFAS testing data is available for CUYON under the EPA's UCMR5 monitoring program.
What water source does CUYON use? ▼
CUYON 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. 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