ScoreYourWater.com gives no verdict on your tap water; it shows what the public records say, as of October 14, 2026: EPA and Florida DEP data (2018-2024) for Miami's two main utilities list five contaminants above published health guidelines, and EPA lists no health-based violations since July 2021. This is public data, not a test of your tap.
Data updated October 24, 2026.Sources: EPA SDWA, EPA UCMR, Florida DEP, EPA SDWIS. By Steve Saper, founder.
What the public data shows for Miami
Miami has 88 scored ZIP codes. Miami-Dade Water & Sewer Department (MDWASD) is the main utility for 86 of them and the City of North Miami Beach (NMB Water) for 2.
Contaminants above a published health guideline, by utility
Contaminants above a published health guideline, by utility
Contaminant
Published health guideline
MDWASD level
NMB Water level
Data years
Arsenic
0.004 ppb
1.7 ppb (425x guideline)average of all sampleshighest sample 2.1 ppbdetected in 3 of 3 samples
0.27 ppb (67x)average of all sampleshighest sample 0.4 ppbdetected in 2 of 3 samples
2020-2022
Bromodichloromethane
0.06 ppb
8.59 ppb (143x)average of all sampleshighest sample 22 ppbdetected in 83 of 88 samples
2.25 ppb (38x)average of all sampleshighest sample 4.76 ppbdetected in 18 of 22 samples
2020-2022
Dibromochloromethane
0.1 ppb
4.75 ppb (48x)average of all sampleshighest sample 13.1 ppbdetected in 63 of 88 samples
A legal limit and a health guideline are different
A legal limit is an enforceable standard set by EPA under the Safe Drinking Water Act. Limits weigh health research together with the cost and feasibility of treatment. A health guideline is published by public-health sources and based on health research alone. The guidelines used here come from California OEHHA; they are not Florida or federal legal limits and are not enforceable. A utility can meet every legal limit and still be above a published health guideline, which is why the table above shows both.
Ask the question by ZIP
The same two utilities serve most of Miami, so most Miami ZIPs show the same utility results. What changes by ZIP is which utility is the main one, the confidence of that match, and the housing mix. Your water bill names your utility.
Ask the question by ZIP
Question
Where to look
Which utility serves my ZIP?
Your ZIP report, or your water bill
Which Miami ZIPs have a different utility?
33163 and 33169 are served mainly by NMB Water (Water Score 57 out of 100); the other 86 by MDWASD (Water Score 50)
What does the housing look like?
621,868 housing units across 47 ZIPs with data: 51.7% single-family, 41.7% in buildings of five or more units, 50.8% owner-occupied (Census ACS 2024 5-year)
What does the housing look like in ZIP 33132?
14,089 housing units: 2.3% single-family, 97.4% in buildings of five or more units, 25.7% owner-occupied (Census ACS 2024 5-year). ZIP 33132 report
What does the housing look like in ZIP 33131?
18,783 housing units: 2.5% single-family, 97.3% in buildings of five or more units, 37% owner-occupied (Census ACS 2024 5-year). ZIP 33131 report
What does the housing look like in ZIP 33185?
9,134 housing units: 98.4% single-family, 0.1% in buildings of five or more units, 81.3% owner-occupied (Census ACS 2024 5-year). ZIP 33185 report
What does the housing look like in ZIP 33194?
1,990 housing units: 93.4% single-family, 2.7% in buildings of five or more units, 75.9% owner-occupied (Census ACS 2024 5-year). ZIP 33194 report
EPA's 2024 rule sets a limit of 4.0 parts per trillion each for PFOA and PFOS; water systems must meet it by April 2029. In May 2026 EPA proposed allowing extensions to April 2031.
Average above 4.0 ppt, the limit in EPA's 2024 PFAS rule (water systems must meet it by April 2029; EPA has proposed allowing until 2031)
Average above 4.0 ppt, the limit in EPA's 2024 PFAS rule (water systems must meet it by April 2029; EPA has proposed allowing until 2031)
18.5 pptaverage of all sampleshighest sample 20 pptdetected in 2 of 2 samples
5.3 pptaverage of all sampleshighest sample 5.3 pptdetected in 2 of 2 samples
2024
The level shown is the average of all of the utility's results in the years shown, with results below EPA's reporting level counted as zero. The highest single result and the number of samples in which it was detected are shown with each level.
Where else the answer lives
The utilities' own Consumer Confidence Reports are the primary record. MDWASD and NMB Water each publish an annual Consumer Confidence Report. If you want your own tap tested, use a state-certified laboratory (Florida Department of Health lists them). ZIP reports describe the utility's public results, not your home's plumbing.
Approximate service area from EPA's Community Water System Service Area Boundaries; some boundaries are modeled estimates. Your water bill names your utility.
Solid: EPA has this type of record for the system. Grey: it does not.
Questions people ask
Is Miami tap water safe to drink?
We don't give a safe or unsafe verdict. Here is what the public data shows: EPA and Florida DEP data (2018-2024) show Miami's two main utilities with five contaminants above published health guidelines, and none with a recorded health-based violation since July 2021. A guideline and a legal limit are different things, and this is public data, not a test of your tap.
Which utility supplies water in Miami?
Miami-Dade Water & Sewer Department is the main utility for 86 of Miami's 88 scored ZIP codes, and the City of North Miami Beach (NMB Water) for the other two (33163 and 33169). EPA SDWA records show neither buys water from another system. Your water bill names your utility.
Why does the report list contaminants above guidelines when the utility meets legal limits?
Legal limits and health guidelines are set differently. A legal limit weighs health research together with cost and feasibility; a health guideline is based on health research alone. A utility can meet every legal limit and still be above a published guideline.
Does Miami tap water contain PFAS?
EPA's UCMR 5 data lists PFOS and PFOA at averages of 14.2 and 5.4 ppt for MDWASD (2023-2024) and 18.5 and 5.3 ppt for NMB Water (2024). Under EPA's 2024 PFAS rule, water systems must meet the PFOA and PFOS limits (4.0 ppt each) by April 2029; in May 2026 EPA proposed allowing extensions to April 2031. Results before then are monitoring data, not violations. This is public data, not a test of your tap.
How recent is this data?
Test results cover 2018-2024, and EPA compliance records come from the July to September 2026 extract. Data may be one to three years old and may not reflect the water at your tap.
1.06 ppb (11x)average of all sampleshighest sample 3.28 ppbdetected in 9 of 22 samples
2020-2022
Chloroform
0.4 ppb
18.1 ppb (45x)average of all sampleshighest sample 36 ppbdetected in 87 of 87 samples
7.81 ppb (20x)average of all sampleshighest sample 23.6 ppbdetected in 22 of 22 samples
2020-2022
Bromoform
0.5 ppb
0.56 ppb (1.1x)average of all sampleshighest sample 1.9 ppbdetected in 40 of 88 samples
0.01 ppb (below guideline)average of all sampleshighest sample 0.26 ppbdetected in 1 of 22 samples
2020-2022
Public data from EPA SDWA, EPA UCMR and Florida DEP, 2018-2024. Guidelines are California OEHHA public health goals (arsenic, 2004; trihalomethanes, February 2020). It isn't a test of your tap, and your water can differ.
The same contaminants next to the federal legal limit
The same contaminants next to the federal legal limit
Measure
Federal legal limit
MDWASD
NMB Water
Data years
Arsenic
10 ppb (EPA, 40 CFR 141.62)
1.7 ppbaverage of all sampleshighest sample 2.1 ppbdetected in 3 of 3 samples
0.27 ppbaverage of all sampleshighest sample 0.4 ppbdetected in 2 of 3 samples
2020-2022
Total trihalomethanes (TTHMs)
80 ppb
31.7 ppbaverage of all sampleshighest sample 71 ppbdetected in 153 of 153 samples
13.2 ppbaverage of all sampleshighest sample 28 ppbdetected in 36 of 36 samples
2018-2022
Haloacetic acids (HAA5)
60 ppb
28.7 ppbaverage of all sampleshighest sample 66.7 ppbdetected in 153 of 153 samples
13.5 ppbaverage of all sampleshighest sample 34.3 ppbdetected in 36 of 36 samples
2018-2022
Public data from EPA SDWA and Florida DEP, 2018-2022. It isn't a test of your tap, and your water can differ.
Health-based violations (EPA SDWIS): none recorded for either utility for compliance periods starting since July 1, 2021. Source: EPA SDWA bulk extract, July to September 2026.
Each of these averaged above 4.0 ppt across all of the utility's samples, with results below the reporting level counted as zero. EPA judges compliance on a running annual average at each sampling point, so our combined average is a guide, not a compliance result. Under EPA's 2024 PFAS rule, water systems must meet the PFOA and PFOS limits (4.0 ppt each) by April 2029; in May 2026 EPA proposed allowing extensions to April 2031. Results before then are monitoring data, not violations.
Public data from EPA UCMR 5, 2023–2024. It isn't a test of your tap, and your water can differ. Last checked against the Federal Register: October 25, 2026.