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Community Water System · PWS PR0003643

Ponce de Leon

Mayaguez, Puerto Rico 00680 - drinking water served from surface water sources to 9,740 people, tracked in EPA SDWIS and UCMR5.

9,740
People served
114
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 114 drinking-water violations at Ponce de Leon - below the Puerto Rico per-system average.

114
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
9,740
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Ponce de Leon

Ponce de Leon is a local-owned community water system that delivers drinking water to 9,740 residents in Mayaguez, Puerto Rico (Mayaguez Municipio County) through 3,648 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 114 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 6 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. Statewide, 40 of 99 UCMR5-tested systems have reported PFAS detections (40.4%).

Ponce de Leon's 114 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
9,740
Total Violations
114
Health-Based Violations
0
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
3,648
County
Mayaguez 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 6 2016
Cryptosporidium MR 5 2017
Turbidity MR 5 2017
Interim Enhanced Surface Water Treatment Rule MR 5 2018
E. COLI MR 5 2017
OXAMYL MR 3 2022
Carbofuran MR 3 2022
Consumer Confidence Rule Other 3 2020
Surface Water Treatment Rule MR 2 2018
Endrin MR 2 2022
Methoxychlor MR 2 2022
Toxaphene MR 2 2022
Dalapon MR 2 2022
Diquat MR 2 2022
Endothall MR 2 2022
Simazine MR 2 2022
Di(2-ethylhexyl) phthalate MR 2 2022
LASSO MR 2 2022
Heptachlor MR 2 2022
2,4-D MR 2 2022
HEXACHLOROBENZENE MR 2 2022
Pentachlorophenol MR 2 2022
Total Polychlorinated Biphenyls (PCB) MR 2 2022
Chlordane MR 2 2022
Arsenic MR 2 2022
Cadmium MR 2 2022
CYANIDE MR 2 2022
Beryllium, Total MR 2 2022
Thallium, Total MR 2 2022
Selenium MR 2 2022

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 Ponce de Leon.

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 PR0003643 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 OXAMYL MR 3 SDWIS / PR0003643 / 2036
2022 Carbofuran MR 3 SDWIS / PR0003643 / 2046
2022 Endrin MR 2 SDWIS / PR0003643 / 2005
2022 Methoxychlor MR 2 SDWIS / PR0003643 / 2015
2022 Toxaphene MR 2 SDWIS / PR0003643 / 2020
2022 Dalapon MR 2 SDWIS / PR0003643 / 2031
2022 Diquat MR 2 SDWIS / PR0003643 / 2032
2022 Endothall MR 2 SDWIS / PR0003643 / 2033
2022 Simazine MR 2 SDWIS / PR0003643 / 2037
2022 Di(2-ethylhexyl) phthalate MR 2 SDWIS / PR0003643 / 2039
2022 LASSO MR 2 SDWIS / PR0003643 / 2051
2022 Heptachlor MR 2 SDWIS / PR0003643 / 2065
2022 2,4-D MR 2 SDWIS / PR0003643 / 2105
2022 HEXACHLOROBENZENE MR 2 SDWIS / PR0003643 / 2274
2022 Pentachlorophenol MR 2 SDWIS / PR0003643 / 2326

How Ponce de Leon Compares

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

Metric Ponce de Leon Puerto Rico avg Federal benchmark
Total violations 114 358.4 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 9,740 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 Ponce de Leon water safe to drink? ▼
Ponce de Leon (PWS ID: PR0003643) has 114 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 9,740 people using Surface Water sources.
How many people does Ponce de Leon serve? ▼
Ponce de Leon serves 9,740 people in Mayaguez, Puerto Rico. It is a Local-owned system using Surface Water water sources with 3,648 service connections.
What type of violations does Ponce de Leon have? ▼
Ponce de Leon has 114 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 Ponce de Leon water? ▼
No PFAS testing data is available for Ponce de Leon under the EPA's UCMR5 monitoring program.
What water source does Ponce de Leon use? ▼
Ponce de Leon 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. 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.