US ARMY, FORT BUCHANAN

Q: Is US ARMY, FORT BUCHANAN water safe to drink?

US ARMY, FORT BUCHANAN (PWS ID: PR0132051) has 241 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 2 PFAS compounds found. This system serves 6,411 people using Surface Water sources.

Q: What type of violations does US ARMY, FORT BUCHANAN have?

US ARMY, FORT BUCHANAN has 241 total violations: 0 health-based violations (MCL exceedances or treatment failures), 240 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Q: Has PFAS been detected in US ARMY, FORT BUCHANAN water?

Yes. UCMR5 testing detected 2 PFAS compounds in US ARMY, FORT BUCHANAN's water supply: PFHxS, PFOS. PFAS are persistent "forever chemicals" that do not break down in the environment.

Q: What water source does US ARMY, FORT BUCHANAN use?

US ARMY, FORT BUCHANAN 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: PR0132051 · GUAYNABO, Puerto Rico 00934

US ARMY, FORT BUCHANAN serves 6,411 people in GUAYNABO, Puerto Rico using Surface Water water sources. It has 241 recorded EPA violations, including 0 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (2 compounds found).

Water Quality Snapshot: US ARMY, FORT BUCHANAN

US ARMY, FORT BUCHANAN is a federal-owned community water system that delivers drinking water to 6,411 residents in GUAYNABO, Puerto Rico (Guaynabo Municipio County) through 2,392 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 241 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 240 monitoring and reporting violations are on file. The most recent violation on record dates to 2019.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 9 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 2 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 0.0046 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

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. US ARMY, FORT BUCHANAN's 241 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.

PFAS Detected

2 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served

6,411

Total Violations

241

Health-Based Violations

Water Source

Surface Water

System Details

System Type: Community
Owner Type: Federal
Connections: 2,392
County: Guaynabo Municipio
School/Daycare: No
MCL Violations: 0
Monitoring Violations: 240
Treatment Tech Violations: 0

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Surface Water Treatment Rule	MR	9	2003
Xylenes, Total	MR	4	2016
o-Dichlorobenzene	MR	4	2016
Vinyl chloride	MR	4	2016
1,1-Dichloroethylene	MR	4	2016
trans-1,2-Dichloroethylene	MR	4	2016
1,2-Dichloroethane	MR	4	2016
Carbon tetrachloride	MR	4	2016
1,2-Dichloropropane	MR	4	2016
CHLOROBENZENE	MR	4	2016
Ethylbenzene	MR	4	2016
Styrene	MR	4	2016
Endrin	MR	4	2016
Methoxychlor	MR	4	2016
Endothall	MR	4	2016
Di(2-ethylhexyl) adipate	MR	4	2016
Simazine	MR	4	2016
Di(2-ethylhexyl) phthalate	MR	4	2016
Picloram	MR	4	2016
Dinoseb	MR	4	2016
Carbofuran	MR	4	2016
Heptachlor	MR	4	2016
2,4,5-TP	MR	4	2016
HEXACHLOROBENZENE	MR	4	2016
Benzo(a)pyrene	MR	4	2016
Pentachlorophenol	MR	4	2016
Total Polychlorinated Biphenyls (PCB)	MR	4	2016
1,2-DIBROMO-3-CHLOROPROPANE	MR	4	2016
ETHYLENE DIBROMIDE	MR	4	2016
Chlordane	MR	4	2016

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 3 of 180 samples detected PFAS.

Contaminant	Date	Result	MRL	Status
NEtFOSAA	9/20/2023	<0.005 µg/L	0.005 µg/L	Not Detected
ADONA	9/20/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFBS	9/20/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFHpA	9/20/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxS	9/20/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFNA	9/20/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFOS	9/20/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFOA	9/20/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFDA	9/20/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFDoA	9/20/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxA	9/20/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFUnA	9/20/2023	<0.002 µg/L	0.002 µg/L	Not Detected
9Cl-PF3ONS	9/20/2023	<0.002 µg/L	0.002 µg/L	Not Detected
PFMPA	9/20/2023	<0.004 µg/L	0.004 µg/L	Not Detected
HFPO-DA	9/20/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFBA	9/20/2023	<0.005 µg/L	0.005 µg/L	Not Detected
6:2 FTS	9/20/2023	<0.005 µg/L	0.005 µg/L	Not Detected
4:2 FTS	9/20/2023	<0.003 µg/L	0.003 µg/L	Not Detected
8:2 FTS	9/20/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFPeA	9/20/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFEESA	9/20/2023	<0.003 µg/L	0.003 µg/L	Not Detected
NFDHA	9/20/2023	<0.02 µg/L	0.02 µg/L	Not Detected
PFPeS	9/20/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFHpS	9/20/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFTA	9/20/2023	<0.008 µg/L	0.008 µg/L	Not Detected
11Cl-PF3OUdS	9/20/2023	<0.005 µg/L	0.005 µg/L	Not Detected
NMeFOSAA	9/20/2023	<0.006 µg/L	0.006 µg/L	Not Detected
PFTrDA	9/20/2023	<0.007 µg/L	0.007 µg/L	Not Detected
PFMBA	9/20/2023	<0.003 µg/L	0.003 µg/L	Not Detected
lithium	8/23/2023	<9 µg/L	9 µg/L	Not Detected
NEtFOSAA	8/23/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFTrDA	8/23/2023	<0.007 µg/L	0.007 µg/L	Not Detected
6:2 FTS	8/23/2023	<0.005 µg/L	0.005 µg/L	Not Detected
NMeFOSAA	8/23/2023	<0.006 µg/L	0.006 µg/L	Not Detected
lithium	8/23/2023	<9 µg/L	9 µg/L	Not Detected
PFTA	8/23/2023	<0.008 µg/L	0.008 µg/L	Not Detected
9Cl-PF3ONS	8/23/2023	<0.002 µg/L	0.002 µg/L	Not Detected
PFBS	8/23/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFHpA	8/23/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxS	8/23/2023	0.0035 µg/L	0.003 µg/L	Detected
PFNA	8/23/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFOS	8/23/2023	0.0040 µg/L	0.004 µg/L	Detected
PFOA	8/23/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFDA	8/23/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFDoA	8/23/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxA	8/23/2023	<0.003 µg/L	0.003 µg/L	Not Detected
8:2 FTS	8/23/2023	<0.005 µg/L	0.005 µg/L	Not Detected
11Cl-PF3OUdS	8/23/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFHpS	8/23/2023	<0.003 µg/L	0.003 µg/L	Not Detected
ADONA	8/23/2023	<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 US ARMY, FORT BUCHANAN.

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 PR0132051 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
2019	Lead and Copper Rule	MR	2	SDWIS / PR0132051 / 5000
2016	Xylenes, Total	MR	4	SDWIS / PR0132051 / 2955
2016	o-Dichlorobenzene	MR	4	SDWIS / PR0132051 / 2968
2016	Vinyl chloride	MR	4	SDWIS / PR0132051 / 2976
2016	1,1-Dichloroethylene	MR	4	SDWIS / PR0132051 / 2977
2016	trans-1,2-Dichloroethylene	MR	4	SDWIS / PR0132051 / 2979
2016	1,2-Dichloroethane	MR	4	SDWIS / PR0132051 / 2980
2016	Carbon tetrachloride	MR	4	SDWIS / PR0132051 / 2982
2016	1,2-Dichloropropane	MR	4	SDWIS / PR0132051 / 2983
2016	CHLOROBENZENE	MR	4	SDWIS / PR0132051 / 2989
2016	Ethylbenzene	MR	4	SDWIS / PR0132051 / 2992
2016	Styrene	MR	4	SDWIS / PR0132051 / 2996
2016	Endrin	MR	4	SDWIS / PR0132051 / 2005
2016	Methoxychlor	MR	4	SDWIS / PR0132051 / 2015
2016	Endothall	MR	4	SDWIS / PR0132051 / 2033

How US ARMY, FORT BUCHANAN Compares

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

Metric	US ARMY, FORT BUCHANAN	Puerto Rico avg	Federal benchmark
Total violations	241	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	2 compounds	40.4%	EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served	6,411	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 US ARMY, FORT BUCHANAN water safe to drink? ▼

US ARMY, FORT BUCHANAN (PWS ID: PR0132051) has 241 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 2 PFAS compounds found. This system serves 6,411 people using Surface Water sources.

How many people does US ARMY, FORT BUCHANAN serve? ▼

US ARMY, FORT BUCHANAN serves 6,411 people in GUAYNABO, Puerto Rico. It is a Federal-owned system using Surface Water water sources with 2,392 service connections.

What type of violations does US ARMY, FORT BUCHANAN have? ▼

US ARMY, FORT BUCHANAN has 241 total violations: 0 health-based violations (MCL exceedances or treatment failures), 240 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in US ARMY, FORT BUCHANAN water? ▼

Yes. UCMR5 testing detected 2 PFAS compounds in US ARMY, FORT BUCHANAN's water supply: PFHxS, PFOS. PFAS are persistent "forever chemicals" that do not break down in the environment.

What water source does US ARMY, FORT BUCHANAN use? ▼

US ARMY, FORT BUCHANAN 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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