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Community Water System · PWS PR0004915

Coqui

Salinas, Puerto Rico 00751 - drinking water served from groundwater sources to 6,307 people, tracked in EPA SDWIS and UCMR5.

6,307
People served
421
EPA violations
19
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 421 drinking-water violations at Coqui, 5% of them health-based - above the Puerto Rico per-system average.

421
Total EPA violations on record
5%
Health-based (MCL / treatment failure)
6,307
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Coqui

Coqui is a local-owned community water system that delivers drinking water to 6,307 residents in Salinas, Puerto Rico (Salinas Municipio County) through 2,362 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 421 total violations for this system , of which 19 (5%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 392 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Nitrate, recorded in 20 violations (MR). 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%).

Coqui's 421 violations sit above 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
6,307
Total Violations
421
Health-Based Violations
19
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
2,362
County
Salinas Municipio
School/Daycare
No
MCL Violations
19
Monitoring Violations
392
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate MR 20 2024
Coliform (TCR) MCL 19 2011
Mercury MR 16 2013
ETHYLENE DIBROMIDE MR 15 2019
1,2-DIBROMO-3-CHLOROPROPANE MR 15 2019
Arsenic MR 13 2013
Antimony, Total MR 13 2013
Thallium, Total MR 13 2013
Lead and Copper Rule MR 11 2013
Di(2-ethylhexyl) adipate MR 10 2018
Benzo(a)pyrene MR 10 2018
Di(2-ethylhexyl) phthalate MR 10 2018
BHC-GAMMA MR 8 2018
Methoxychlor MR 8 2018
Toxaphene MR 8 2018
Diquat MR 8 2018
Glyphosate MR 8 2018
OXAMYL MR 8 2018
Simazine MR 8 2018
Picloram MR 8 2018
Dinoseb MR 8 2018
Carbofuran MR 8 2018
Heptachlor MR 8 2018
Heptachlor epoxide MR 8 2018
2,4-D MR 8 2018
2,4,5-TP MR 8 2018
Pentachlorophenol MR 8 2018
Chlordane MR 8 2018
Endrin MR 8 2018
Dalapon MR 8 2018

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 232 samples detected PFAS.

Contaminant Date Result MRL Status
PFNA 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 8/23/2023 <2.00 ppt 2.00 ppt Not Detected
PFHxA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFOS 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
ADONA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 8/23/2023 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 8/23/2023 <7.00 ppt 7.00 ppt Not Detected
PFTA 8/23/2023 <8.00 ppt 8.00 ppt Not Detected
PFHpS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 8/23/2023 <20.00 ppt 20.00 ppt Not Detected
PFEESA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 8/23/2023 <2.00 ppt 2.00 ppt Not Detected
PFPeA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFOS 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
PFTrDA 8/23/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 8/23/2023 <6.00 ppt 6.00 ppt Not Detected
PFBS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
PFTA 8/23/2023 <8.00 ppt 8.00 ppt Not Detected
PFOA 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
PFEESA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
PFHxS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 8/23/2023 <2.00 ppt 2.00 ppt Not Detected
NFDHA 8/23/2023 <20.00 ppt 20.00 ppt Not Detected
PFMPA 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeS 8/23/2023 <4.00 ppt 4.00 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 Coqui.

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 PR0004915 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
2024 Nitrate MR 20 SDWIS / PR0004915 / 1040
2020 Consumer Confidence Rule Other 4 SDWIS / PR0004915 / 7000
2019 ETHYLENE DIBROMIDE MR 15 SDWIS / PR0004915 / 2946
2019 1,2-DIBROMO-3-CHLOROPROPANE MR 15 SDWIS / PR0004915 / 2931
2018 Di(2-ethylhexyl) adipate MR 10 SDWIS / PR0004915 / 2035
2018 Benzo(a)pyrene MR 10 SDWIS / PR0004915 / 2306
2018 Di(2-ethylhexyl) phthalate MR 10 SDWIS / PR0004915 / 2039
2018 BHC-GAMMA MR 8 SDWIS / PR0004915 / 2010
2018 Methoxychlor MR 8 SDWIS / PR0004915 / 2015
2018 Toxaphene MR 8 SDWIS / PR0004915 / 2020
2018 Diquat MR 8 SDWIS / PR0004915 / 2032
2018 Glyphosate MR 8 SDWIS / PR0004915 / 2034
2018 OXAMYL MR 8 SDWIS / PR0004915 / 2036
2018 Simazine MR 8 SDWIS / PR0004915 / 2037
2018 Picloram MR 8 SDWIS / PR0004915 / 2040

How Coqui Compares

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

Metric Coqui Puerto Rico avg Federal benchmark
Total violations 421 358.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 19 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 6,307 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 Coqui water safe to drink? ▼
Coqui (PWS ID: PR0004915) has 421 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 6,307 people using Groundwater sources.
How many people does Coqui serve? ▼
Coqui serves 6,307 people in Salinas, Puerto Rico. It is a Local-owned system using Groundwater water sources with 2,362 service connections.
What type of violations does Coqui have? ▼
Coqui has 421 total violations: 19 health-based violations (MCL exceedances or treatment failures), 392 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Coqui water? ▼
No. Coqui was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Coqui use? ▼
Coqui 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.
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.

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.