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Community Water System · PWS PR0132051

US Army, Fort Buchanan

Guaynabo, Puerto Rico 00934 - drinking water served from surface water sources to 6,411 people, tracked in EPA SDWIS and UCMR5.

6,411
People served
241
EPA violations
0
Health-based
2 PFAS
UCMR5 result

The verdict

EPA records 241 drinking-water violations at US Army, Fort Buchanan - below the Puerto Rico per-system average, and UCMR5 testing detected 2 PFAS compounds.

241
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
6,411
People served by this system
2
PFAS compounds detected (UCMR5)

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 4.6 ppt (parts per trillion). 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. Statewide, 40 of 99 UCMR5-tested systems have reported PFAS detections (40.4%).

US Army, Fort Buchanan's 241 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.

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
0
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 174 samples detected PFAS.

Contaminant Date Result MRL Status
NEtFOSAA 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
ADONA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 9/20/2023 <2.00 ppt 2.00 ppt Not Detected
9Cl-PF3ONS 9/20/2023 <2.00 ppt 2.00 ppt Not Detected
PFMPA 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
HFPO-DA 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 9/20/2023 <20.00 ppt 20.00 ppt Not Detected
PFPeS 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 9/20/2023 <8.00 ppt 8.00 ppt Not Detected
11Cl-PF3OUdS 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 9/20/2023 <6.00 ppt 6.00 ppt Not Detected
PFTrDA 9/20/2023 <7.00 ppt 7.00 ppt Not Detected
PFMBA 9/20/2023 <3.00 ppt 3.00 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
6:2 FTS 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 8/23/2023 <6.00 ppt 6.00 ppt Not Detected
PFTA 8/23/2023 <8.00 ppt 8.00 ppt Not Detected
9Cl-PF3ONS 8/23/2023 <2.00 ppt 2.00 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
PFHxS 8/23/2023 3.50 ppt 3.00 ppt Detected
PFNA 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 8/23/2023 4.00 ppt 4.00 ppt Detected
PFOA 8/23/2023 <4.00 ppt 4.00 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
11Cl-PF3OUdS 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
PFHpS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
ADONA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 8/23/2023 <5.00 ppt 5.00 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 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 (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 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.
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.