MARICAO

Q: Is MARICAO water safe to drink?

MARICAO (PWS ID: PR0003353) has 119 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 3,474 people using Surface Water sources.

Q: How many people does MARICAO serve?

MARICAO serves 3,474 people in MARICAO, Puerto Rico. It is a Local-owned system using Surface Water water sources with 1,301 service connections.

Q: What type of violations does MARICAO have?

MARICAO has 119 total violations: 28 health-based violations (MCL exceedances or treatment failures), 80 monitoring/reporting violations, and 15 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Q: Has PFAS been detected in MARICAO water?

No. MARICAO was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.

Q: What water source does MARICAO use?

MARICAO uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.

Q: 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.

Reviewed byPlainWater Editorial, Drinking Water Quality Editorial Team · June 4, 2026

PWS ID: PR0003353 · MARICAO, Puerto Rico 00606

MARICAO serves 3,474 people in MARICAO, Puerto Rico using Surface Water water sources. It has 119 recorded EPA violations, including 28 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: MARICAO

MARICAO is a local-owned community water system that delivers drinking water to 3,474 residents in MARICAO, Puerto Rico (Maricao Municipio County) through 1,301 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 119 total violations for this system , of which 28 (24%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 80 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 Surface Water Treatment Rule, recorded in 8 violations (TT, health-based). 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. MARICAO's 119 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

3,474

Total Violations

119

Health-Based Violations

Water Source

Surface Water

System Details

System Type: Community
Owner Type: Local
Connections: 1,301
County: Maricao Municipio
School/Daycare: No
MCL Violations: 13
Monitoring Violations: 80
Treatment Tech Violations: 15

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Surface Water Treatment Rule	TT	8	2004
CARBON, TOTAL	TT	7	2005
Coliform (TCR)	MCL	7	2013
TTHM	MCL	6	2016
Lead and Copper Rule	MR	5	2016
Cryptosporidium	MR	4	2011
Consumer Confidence Rule	Other	4	2020
Total Haloacetic Acids (HAA5)	MR	4	2018
Mercury	MR	3	2006
1,2,4-Trichlorobenzene	MR	2	2005
Xylenes, Total	MR	2	2005
DICHLOROMETHANE	MR	2	2005
Vinyl chloride	MR	2	2005
1,1-Dichloroethylene	MR	2	2005
trans-1,2-Dichloroethylene	MR	2	2005
Carbon tetrachloride	MR	2	2005
1,2-Dichloropropane	MR	2	2005
1,1,2-Trichloroethane	MR	2	2005
Tetrachloroethylene	MR	2	2005
CHLOROBENZENE	MR	2	2005
Benzene	MR	2	2005
Toluene	MR	2	2005
Styrene	MR	2	2005
TTHM	MR	2	2018
E. COLI	MR	2	2018
Nitrate	MR	2	1984
Chromium	MR	2	1984
Barium	MR	2	1984
Fluoride	MR	2	1984
Selenium	MR	2	1984

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 90 samples detected PFAS.

Contaminant	Date	Result	MRL	Status
PFTrDA	9/17/2025	<0.007 µg/L	0.007 µg/L	Not Detected
PFNA	9/17/2025	<0.004 µg/L	0.004 µg/L	Not Detected
PFHxA	9/17/2025	<0.003 µg/L	0.003 µg/L	Not Detected
NEtFOSAA	9/17/2025	<0.005 µg/L	0.005 µg/L	Not Detected
PFTA	9/17/2025	<0.008 µg/L	0.008 µg/L	Not Detected
11Cl-PF3OUdS	9/17/2025	<0.005 µg/L	0.005 µg/L	Not Detected
PFBS	9/17/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFDoA	9/17/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFDA	9/17/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFOA	9/17/2025	<0.004 µg/L	0.004 µg/L	Not Detected
PFOS	9/17/2025	<0.004 µg/L	0.004 µg/L	Not Detected
PFHxS	9/17/2025	<0.003 µg/L	0.003 µg/L	Not Detected
NMeFOSAA	9/17/2025	<0.006 µg/L	0.006 µg/L	Not Detected
9Cl-PF3ONS	9/17/2025	<0.002 µg/L	0.002 µg/L	Not Detected
PFHpA	9/17/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFMBA	9/17/2025	<0.003 µg/L	0.003 µg/L	Not Detected
ADONA	9/17/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFUnA	9/17/2025	<0.002 µg/L	0.002 µg/L	Not Detected
PFPeS	9/17/2025	<0.004 µg/L	0.004 µg/L	Not Detected
NFDHA	9/17/2025	<0.02 µg/L	0.02 µg/L	Not Detected
PFHpS	9/17/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFPeA	9/17/2025	<0.003 µg/L	0.003 µg/L	Not Detected
lithium	9/17/2025	<9 µg/L	9 µg/L	Not Detected
PFMPA	9/17/2025	<0.004 µg/L	0.004 µg/L	Not Detected
8:2 FTS	9/17/2025	<0.005 µg/L	0.005 µg/L	Not Detected
4:2 FTS	9/17/2025	<0.003 µg/L	0.003 µg/L	Not Detected
6:2 FTS	9/17/2025	<0.005 µg/L	0.005 µg/L	Not Detected
PFBA	9/17/2025	<0.005 µg/L	0.005 µg/L	Not Detected
HFPO-DA	9/17/2025	<0.005 µg/L	0.005 µg/L	Not Detected
PFEESA	9/17/2025	<0.003 µg/L	0.003 µg/L	Not Detected
8:2 FTS	6/18/2025	<0.005 µg/L	0.005 µg/L	Not Detected
PFDoA	6/18/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxA	6/18/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFUnA	6/18/2025	<0.002 µg/L	0.002 µg/L	Not Detected
9Cl-PF3ONS	6/18/2025	<0.002 µg/L	0.002 µg/L	Not Detected
HFPO-DA	6/18/2025	<0.005 µg/L	0.005 µg/L	Not Detected
PFBA	6/18/2025	<0.005 µg/L	0.005 µg/L	Not Detected
PFDA	6/18/2025	<0.003 µg/L	0.003 µg/L	Not Detected
4:2 FTS	6/18/2025	<0.003 µg/L	0.003 µg/L	Not Detected
11Cl-PF3OUdS	6/18/2025	<0.005 µg/L	0.005 µg/L	Not Detected
PFPeA	6/18/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFMBA	6/18/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFEESA	6/18/2025	<0.003 µg/L	0.003 µg/L	Not Detected
NFDHA	6/18/2025	<0.02 µg/L	0.02 µg/L	Not Detected
PFPeS	6/18/2025	<0.004 µg/L	0.004 µg/L	Not Detected
PFHpS	6/18/2025	<0.003 µg/L	0.003 µg/L	Not Detected
6:2 FTS	6/18/2025	<0.005 µg/L	0.005 µg/L	Not Detected
NEtFOSAA	6/18/2025	<0.005 µg/L	0.005 µg/L	Not Detected
lithium	6/18/2025	<9 µg/L	9 µg/L	Not Detected
ADONA	6/18/2025	<0.003 µg/L	0.003 µg/L	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 MARICAO.

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 PR0003353 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	Consumer Confidence Rule	Other	4	SDWIS / PR0003353 / 7000
2018	Total Haloacetic Acids (HAA5)	MR	4	SDWIS / PR0003353 / 2456
2018	TTHM	MR	2	SDWIS / PR0003353 / 2950
2018	E. COLI	MR	2	SDWIS / PR0003353 / 3014
2018	Surface Water Treatment Rule	MR	2	SDWIS / PR0003353 / 0200
2016	TTHM	MCL	6	SDWIS / PR0003353 / 2950
2016	Lead and Copper Rule	MR	5	SDWIS / PR0003353 / 5000
2013	Coliform (TCR)	MCL	7	SDWIS / PR0003353 / 3100
2011	Cryptosporidium	MR	4	SDWIS / PR0003353 / 3015
2006	Mercury	MR	3	SDWIS / PR0003353 / 1035
2005	CARBON, TOTAL	TT	7	SDWIS / PR0003353 / 2920
2005	1,2,4-Trichlorobenzene	MR	2	SDWIS / PR0003353 / 2378
2005	Xylenes, Total	MR	2	SDWIS / PR0003353 / 2955
2005	DICHLOROMETHANE	MR	2	SDWIS / PR0003353 / 2964
2005	Vinyl chloride	MR	2	SDWIS / PR0003353 / 2976

How MARICAO Compares

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

Metric	MARICAO	Puerto Rico avg	Federal benchmark
Total violations	119	358.4	SDWA compliance — any non-zero count is a recorded breach
Health-based violations	28	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	3,474	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 MARICAO water safe to drink? ▼

MARICAO (PWS ID: PR0003353) has 119 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 3,474 people using Surface Water sources.

How many people does MARICAO serve? ▼

MARICAO serves 3,474 people in MARICAO, Puerto Rico. It is a Local-owned system using Surface Water water sources with 1,301 service connections.

What type of violations does MARICAO have? ▼

MARICAO has 119 total violations: 28 health-based violations (MCL exceedances or treatment failures), 80 monitoring/reporting violations, and 15 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in MARICAO water? ▼

No. MARICAO was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.

What water source does MARICAO use? ▼

MARICAO 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.

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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.

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