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Community Water System · PWS PR0003904

Santa Isabel Urbano

Santa Isabel, Puerto Rico 00757 - drinking water served from groundwater sources to 39,884 people, tracked in EPA SDWIS and UCMR5.

39,884
People served
443
EPA violations
24
Health-based
4 PFAS
UCMR5 result

The verdict

EPA records 443 drinking-water violations at Santa Isabel Urbano, 5% of them health-based - above the Puerto Rico per-system average, and UCMR5 testing detected 4 PFAS compounds.

443
Total EPA violations on record
5%
Health-based (MCL / treatment failure)
39,884
People served by this system
4
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Santa Isabel Urbano

Santa Isabel Urbano is a local-owned community water system that delivers drinking water to 39,884 residents in Santa Isabel, Puerto Rico (Santa Isabel Municipio County) through 14,938 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 443 total violations for this system , of which 24 (5%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 408 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 37 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 4 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 10.3 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%).

Santa Isabel Urbano's 443 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.

PFAS Detected

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

Population Served
39,884
Total Violations
443
Health-Based Violations
24
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
14,938
County
Santa Isabel Municipio
School/Daycare
No
MCL Violations
24
Monitoring Violations
408
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate MR 37 2024
Coliform (TCR) MCL 22 2008
Total Polychlorinated Biphenyls (PCB) MR 12 2019
Chlordane MR 10 2019
Endothall MR 10 2019
Endrin MR 10 2019
ETHYLENE DIBROMIDE MR 10 2010
Heptachlor MR 10 2019
HEXACHLOROBENZENE MR 10 2019
Hexachlorocyclopentadiene MR 10 2019
BHC-GAMMA MR 10 2019
Methoxychlor MR 10 2019
OXAMYL MR 10 2010
Simazine MR 10 2019
1,2-DIBROMO-3-CHLOROPROPANE MR 10 2010
LASSO MR 10 2019
Toxaphene MR 10 2019
Carbofuran MR 10 2010
Diquat MR 10 2019
Heptachlor epoxide MR 10 2019
2,4,5-TP MR 9 2010
2,4-D MR 9 2010
Atrazine MR 9 2010
Benzo(a)pyrene MR 9 2010
Dalapon MR 9 2010
Di(2-ethylhexyl) adipate MR 9 2010
Dinoseb MR 9 2010
Glyphosate MR 9 2010
Pentachlorophenol MR 9 2010
Di(2-ethylhexyl) phthalate MR 9 2010

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 6 of 493 samples detected PFAS.

Contaminant Date Result MRL Status
PFUnA 9/26/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 9/26/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 9/26/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 9/26/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 9/26/2023 <5.00 ppt 5.00 ppt Not Detected
PFHxA 9/26/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 9/26/2023 <5.00 ppt 5.00 ppt Not Detected
PFHxS 9/26/2023 4.70 ppt 3.00 ppt Detected
PFBA 9/26/2023 <5.00 ppt 5.00 ppt Not Detected
PFDoA 9/26/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 9/26/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 9/26/2023 <4.00 ppt 4.00 ppt Not Detected
PFNA 9/26/2023 <4.00 ppt 4.00 ppt Not Detected
PFBS 9/26/2023 6.40 ppt 3.00 ppt Detected
PFHpA 9/26/2023 <3.00 ppt 3.00 ppt Not Detected
4:2 FTS 9/26/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 9/26/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 9/26/2023 10.30 ppt 4.00 ppt Detected
NMeFOSAA 9/26/2023 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 9/26/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 9/26/2023 <7.00 ppt 7.00 ppt Not Detected
PFEESA 9/26/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 9/26/2023 <8.00 ppt 8.00 ppt Not Detected
8:2 FTS 9/26/2023 <5.00 ppt 5.00 ppt Not Detected
PFMBA 9/26/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 9/26/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 9/26/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 9/26/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 9/26/2023 <20.00 ppt 20.00 ppt Not Detected
NEtFOSAA 9/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 9/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 9/19/2023 <20.00 ppt 20.00 ppt Not Detected
PFPeS 9/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFTrDA 9/19/2023 <7.00 ppt 7.00 ppt Not Detected
NMeFOSAA 9/19/2023 <6.00 ppt 6.00 ppt Not Detected
8:2 FTS 9/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFHxA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 9/19/2023 <8.00 ppt 8.00 ppt Not Detected
PFUnA 9/19/2023 <2.00 ppt 2.00 ppt Not Detected
PFHpA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 9/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 9/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 9/19/2023 <4.00 ppt 4.00 ppt Not Detected
11Cl-PF3OUdS 9/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFDoA 9/19/2023 <3.00 ppt 3.00 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 Santa Isabel Urbano.

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 PR0003904 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 37 SDWIS / PR0003904 / 1040
2020 Consumer Confidence Rule Other 4 SDWIS / PR0003904 / 7000
2019 Total Polychlorinated Biphenyls (PCB) MR 12 SDWIS / PR0003904 / 2383
2019 Chlordane MR 10 SDWIS / PR0003904 / 2959
2019 Endothall MR 10 SDWIS / PR0003904 / 2033
2019 Endrin MR 10 SDWIS / PR0003904 / 2005
2019 Heptachlor MR 10 SDWIS / PR0003904 / 2065
2019 HEXACHLOROBENZENE MR 10 SDWIS / PR0003904 / 2274
2019 Hexachlorocyclopentadiene MR 10 SDWIS / PR0003904 / 2042
2019 BHC-GAMMA MR 10 SDWIS / PR0003904 / 2010
2019 Methoxychlor MR 10 SDWIS / PR0003904 / 2015
2019 Simazine MR 10 SDWIS / PR0003904 / 2037
2019 LASSO MR 10 SDWIS / PR0003904 / 2051
2019 Toxaphene MR 10 SDWIS / PR0003904 / 2020
2019 Diquat MR 10 SDWIS / PR0003904 / 2032

How Santa Isabel Urbano Compares

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

Metric Santa Isabel Urbano Puerto Rico avg Federal benchmark
Total violations 443 358.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 24 75.7 Indicates a contaminant exceeded a federal MCL
PFAS detection 4 compounds 40.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 39,884 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 Santa Isabel Urbano water safe to drink? ▼
Santa Isabel Urbano (PWS ID: PR0003904) has 443 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 4 PFAS compounds found. This system serves 39,884 people using Groundwater sources.
How many people does Santa Isabel Urbano serve? ▼
Santa Isabel Urbano serves 39,884 people in Santa Isabel, Puerto Rico. It is a Local-owned system using Groundwater water sources with 14,938 service connections.
What type of violations does Santa Isabel Urbano have? ▼
Santa Isabel Urbano has 443 total violations: 24 health-based violations (MCL exceedances or treatment failures), 408 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Santa Isabel Urbano water? ▼
Yes. UCMR5 testing detected 4 PFAS compounds in Santa Isabel Urbano's water supply: PFHxS, PFBS, PFOS, PFBA. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Santa Isabel Urbano use? ▼
Santa Isabel Urbano 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.