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EXPERIMENTAL

PWS ID: PR0004604 · JUANA DIAZ, Puerto Rico 00795

EXPERIMENTAL serves 6,427 people in JUANA DIAZ, Puerto Rico using Groundwater water sources. It has 60 recorded EPA violations, including 4 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (7 compounds found).

Water Quality Snapshot: EXPERIMENTAL

EXPERIMENTAL is a local-owned community water system that delivers drinking water to 6,427 residents in JUANA DIAZ, Puerto Rico (Juana Diaz Municipio County) through 2,407 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 60 total violations for this system , of which 4 (7%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 48 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 Lead and Copper Rule, recorded in 15 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 7 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 0.26 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. EXPERIMENTAL's 60 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

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

Population Served
6,427
Total Violations
60
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
2,407
County
Juana Diaz Municipio
School/Daycare
No
MCL Violations
4
Monitoring Violations
48
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 15 2016
Nitrate MCL 4 2003
Consumer Confidence Rule Other 4 2020
TTHM MR 3 2014
Total Haloacetic Acids (HAA5) MR 3 2014
BHC-GAMMA MR 2 2024
Hexachlorocyclopentadiene MR 2 2024
Heptachlor epoxide MR 2 2024
HEXACHLOROBENZENE MR 2 2024
Endrin MR 2 2024
Heptachlor MR 2 2024
Nitrate MR 2 2024
Toxaphene MR 2 2024
Methoxychlor MR 2 2024
Chlordane MR 2 2024
Total Polychlorinated Biphenyls (PCB) MR 1 2019
Atrazine MR 1 2019
Glyphosate MR 1 2019
Benzo(a)pyrene MR 1 2019
Simazine MR 1 2019
LASSO MR 1 2019
Di(2-ethylhexyl) adipate MR 1 2019

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 24 of 300 samples detected PFAS.

Contaminant Date Result MRL Status
6:2 FTS 8/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
8:2 FTS 8/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFPeA 8/20/2024 0.1100 µg/L 0.003 µg/L Detected
PFMBA 8/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 8/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 8/20/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFHpS 8/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
lithium 8/20/2024 <9 µg/L 9 µg/L Not Detected
4:2 FTS 8/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 8/20/2024 0.0540 µg/L 0.005 µg/L Detected
PFPeS 8/20/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 8/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/20/2024 <0.004 µg/L 0.004 µg/L Not Detected
HFPO-DA 8/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 8/20/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 8/20/2024 <0.008 µg/L 0.008 µg/L Not Detected
NMeFOSAA 8/20/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFBS 8/20/2024 0.0420 µg/L 0.003 µg/L Detected
PFHpA 8/20/2024 0.0130 µg/L 0.003 µg/L Detected
PFNA 8/20/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 8/20/2024 0.0047 µg/L 0.004 µg/L Detected
9Cl-PF3ONS 8/20/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFDA 8/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 8/20/2024 0.2600 µg/L 0.003 µg/L Detected
PFUnA 8/20/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 8/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 8/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
NEtFOSAA 8/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFOA 8/20/2024 0.0220 µg/L 0.004 µg/L Detected
PFPeA 7/10/2024 0.0716 µg/L 0.003 µg/L Detected
PFBS 7/10/2024 0.0301 µg/L 0.003 µg/L Detected
PFHpA 7/10/2024 0.0083 µg/L 0.003 µg/L Detected
PFOS 7/10/2024 0.0041 µg/L 0.004 µg/L Detected
PFOA 7/10/2024 0.0129 µg/L 0.004 µg/L Detected
PFHxA 7/10/2024 0.1534 µg/L 0.003 µg/L Detected
PFBA 7/10/2024 0.0384 µg/L 0.005 µg/L Detected
PFBS 5/17/2023 0.0035 µg/L 0.003 µg/L Detected
PFDoA 5/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 5/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 5/17/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 5/17/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 5/17/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHpA 5/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 5/17/2023 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 5/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 5/17/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 5/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 5/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 5/17/2023 <0.002 µg/L 0.002 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 EXPERIMENTAL.

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 PR0004604 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 BHC-GAMMA MR 2 SDWIS / PR0004604 / 2010
2024 Hexachlorocyclopentadiene MR 2 SDWIS / PR0004604 / 2042
2024 Heptachlor epoxide MR 2 SDWIS / PR0004604 / 2067
2024 HEXACHLOROBENZENE MR 2 SDWIS / PR0004604 / 2274
2024 Endrin MR 2 SDWIS / PR0004604 / 2005
2024 Heptachlor MR 2 SDWIS / PR0004604 / 2065
2024 Nitrate MR 2 SDWIS / PR0004604 / 1040
2024 Toxaphene MR 2 SDWIS / PR0004604 / 2020
2024 Methoxychlor MR 2 SDWIS / PR0004604 / 2015
2024 Chlordane MR 2 SDWIS / PR0004604 / 2959
2020 Consumer Confidence Rule Other 4 SDWIS / PR0004604 / 7000
2019 Total Polychlorinated Biphenyls (PCB) MR 1 SDWIS / PR0004604 / 2383
2019 Atrazine MR 1 SDWIS / PR0004604 / 2050
2019 Glyphosate MR 1 SDWIS / PR0004604 / 2034
2019 Benzo(a)pyrene MR 1 SDWIS / PR0004604 / 2306

How EXPERIMENTAL Compares

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

Metric EXPERIMENTAL Puerto Rico avg Federal benchmark
Total violations 60 358.4 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 4 75.7 Indicates a contaminant exceeded a federal MCL
PFAS detection 7 compounds 40.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 6,427 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 EXPERIMENTAL water safe to drink? ▼
EXPERIMENTAL (PWS ID: PR0004604) has 60 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 7 PFAS compounds found. This system serves 6,427 people using Groundwater sources.
How many people does EXPERIMENTAL serve? ▼
EXPERIMENTAL serves 6,427 people in JUANA DIAZ, Puerto Rico. It is a Local-owned system using Groundwater water sources with 2,407 service connections.
What type of violations does EXPERIMENTAL have? ▼
EXPERIMENTAL has 60 total violations: 4 health-based violations (MCL exceedances or treatment failures), 48 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in EXPERIMENTAL water? ▼
Yes. UCMR5 testing detected 7 PFAS compounds in EXPERIMENTAL's water supply: PFPeA, PFBA, PFBS, PFHpA, PFOS, and others. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does EXPERIMENTAL use? ▼
EXPERIMENTAL 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.

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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.

Read our methodology — how this data is sourced, computed, and verified.

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