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MDWASA/REX UTILITIES

PWS ID: FL4131202 · MIAMI, Florida 33146

MDWASA/REX UTILITIES serves 45,200 people in MIAMI, Florida using Groundwater water sources. It has 19 recorded EPA violations, including 0 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (8 compounds found).

Water Quality Snapshot: MDWASA/REX UTILITIES

MDWASA/REX UTILITIES is a local-owned community water system that delivers drinking water to 45,200 residents in MIAMI, Florida (Miami-Dade County) through 12,700 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 19 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 12 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Total Haloacetic Acids (HAA5), recorded in 4 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 8 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 0.0374 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across Florida, EPA tracks 5,093 public water systems serving 22,381,282 people, with 184,355 cumulative violations and 24,266 health-based violations on record. About 93% of systems in the state carry at least one violation, and state-wide the average per system is 36.2 violations. MDWASA/REX UTILITIES's 19 violations sit below the Florida average. Statewide, 218 of 402 UCMR5-tested systems have reported PFAS detections (54.2%). 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

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

Population Served
45,200
Total Violations
19
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
12,700
County
Miami-Dade
School/Daycare
No
MCL Violations
0
Monitoring Violations
12
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Total Haloacetic Acids (HAA5) MR 4 2023
TTHM MR 4 2023
Revised Total Coliform Rule MON 3 2023
Consumer Confidence Rule Other 2 2023
Nitrate MR 1 2020

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 58 of 300 samples detected PFAS.

Contaminant Date Result MRL Status
PFTrDA 8/12/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFUnA 8/12/2025 <0.002 µg/L 0.002 µg/L Not Detected
lithium 8/12/2025 <9 µg/L 9 µg/L Not Detected
PFTA 8/12/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFOS 8/12/2025 0.0330 µg/L 0.004 µg/L Detected
NEtFOSAA 8/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFPeS 8/12/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/12/2025 0.0151 µg/L 0.003 µg/L Detected
PFHpA 8/12/2025 0.0066 µg/L 0.003 µg/L Detected
PFNA 8/12/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 8/12/2025 0.0084 µg/L 0.004 µg/L Detected
PFDA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 8/12/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFHxA 8/12/2025 0.0111 µg/L 0.003 µg/L Detected
NFDHA 8/12/2025 <0.02 µg/L 0.02 µg/L Not Detected
11Cl-PF3OUdS 8/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 8/12/2025 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 8/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/12/2025 0.0098 µg/L 0.005 µg/L Detected
6:2 FTS 8/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 8/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 8/12/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 8/12/2025 0.0146 µg/L 0.003 µg/L Detected
PFMBA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 8/12/2025 0.0035 µg/L 0.003 µg/L Detected
lithium 8/12/2025 <9 µg/L 9 µg/L Not Detected
PFUnA 8/12/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/12/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/12/2025 0.0097 µg/L 0.003 µg/L Detected
11Cl-PF3OUdS 8/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFNA 8/12/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 8/12/2025 <0.008 µg/L 0.008 µg/L Not Detected
9Cl-PF3ONS 8/12/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFTrDA 8/12/2025 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 8/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 8/12/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFOS 8/12/2025 0.0196 µg/L 0.004 µg/L Detected
PFHpS 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 8/12/2025 <0.02 µg/L 0.02 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 MDWASA/REX UTILITIES.

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 FL4131202 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Florida Drinking Water Authority

Florida Department of Environmental Protection — Drinking Water Program is the primacy agency that licenses and inspects MDWASA/REX UTILITIES under EPA-delegated authority.

Open FL regulator portal

Source: Florida Department of Environmental Protection — Drinking Water Program

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
2023 Total Haloacetic Acids (HAA5) MR 4 SDWIS / FL4131202 / 2456
2023 TTHM MR 4 SDWIS / FL4131202 / 2950
2023 Revised Total Coliform Rule MON 3 SDWIS / FL4131202 / 8000
2023 Consumer Confidence Rule Other 2 SDWIS / FL4131202 / 7000
2020 Nitrate MR 1 SDWIS / FL4131202 / 1040

How MDWASA/REX UTILITIES Compares

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

Metric MDWASA/REX UTILITIES Florida avg Federal benchmark
Total violations 19 36.2 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 0 4.8 Indicates a contaminant exceeded a federal MCL
PFAS detection 8 compounds 54.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 45,200 4,395 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 5,093 regulated public water systems in Florida.

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 MDWASA/REX UTILITIES water safe to drink? ▼
MDWASA/REX UTILITIES (PWS ID: FL4131202) has 19 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 8 PFAS compounds found. This system serves 45,200 people using Groundwater sources.
How many people does MDWASA/REX UTILITIES serve? ▼
MDWASA/REX UTILITIES serves 45,200 people in MIAMI, Florida. It is a Local-owned system using Groundwater water sources with 12,700 service connections.
What type of violations does MDWASA/REX UTILITIES have? ▼
MDWASA/REX UTILITIES has 19 total violations: 0 health-based violations (MCL exceedances or treatment failures), 12 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in MDWASA/REX UTILITIES water? ▼
Yes. UCMR5 testing detected 8 PFAS compounds in MDWASA/REX UTILITIES's water supply: PFOS, PFBS, PFHpA, PFOA, PFHxA, and others. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does MDWASA/REX UTILITIES use? ▼
MDWASA/REX UTILITIES 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 PlainWater Editorial