25 Cities With the Most Haloacetic Acids (HAA5) in Drinking Water (2026)
By Echo Water Research Team8 min read
25
Cities Analyzed
258
Total Contaminants Above Guidelines
239,379
People Affected
We analyzed tap water quality data for hundreds of cities across the United States to identify those with the highest levels of haloacetic. This ranking is based on 2026 data from the EPA and EWG databases.
Haloacetic is a contaminant of growing concern in drinking water. The cities below have the highest detected levels based on the most recent testing data available.
Methodology: Cities are ranked by the detected level of haloacetic (descending), showing those with the highest concentrations first. Data sourced from the EPA Safe Drinking Water
Information System (SDWIS) and the Environmental Working Group (EWG) Tap Water Database.
Only cities with available EWG testing data are included.
Schulter has haloacetic detected at 94.40 ppb. 16 total contaminants were found in the water supply.
What We Found: Key Patterns
The most frequently detected contaminants exceeding health guidelines across these cities are Haloacetic acids (HAA5), Total trihalomethanes (TTHMs), Bromodichloromethane. These appear repeatedly across different water systems and regions.
Geographically, the states most represented in this ranking are Oklahoma (9), Texas (6), Florida (3). Regional water sources, industrial activity, and agricultural runoff all contribute to local water quality variation.
Across all ranked cities, 258 contaminant readings exceed EWG health guidelines, but only 17 exceed EPA legal limits. This gap of 241 highlights how legal standards may not fully protect public health — EPA limits haven't been updated for many contaminants in decades.
Full Rankings Table
Rank
City
State
Detected
Above Guidelines
Above Legal
People Served
1
Statenville
GA
10
9
2
0
2
Durant
OK
21
11
0
15,545
3
Goodfellow AFB
TX
34
16
0
5,241
4
San Angelo
TX
32
15
0
101,004
5
Miles
TX
33
15
0
920
6
Holly Hill
FL
12
4
0
12,417
7
Sikes
LA
14
8
2
639
8
Alice
TX
36
15
0
17,891
9
Sacramento
AK
8
6
1
225
10
Asher
OK
11
8
2
375
11
Wanette
OK
12
8
2
402
12
Provencal
LA
13
8
2
1,032
13
Progreso
TX
33
17
0
14,292
14
Joaquin
TX
31
14
0
1,869
15
Logansport
LA
22
12
0
0
16
Tatitlek
AK
8
7
1
95
17
Riviera Beach
FL
14
5
0
31,500
18
Riviera Bch
FL
14
5
0
890
19
Maysville
OK
14
10
2
0
20
Council Hill
OK
14
11
0
0
21
Pittsburg
OK
10
7
2
280
22
Caseyville
IL
32
17
0
17,000
23
Okmulgee
OK
15
10
0
13,495
24
Morris
OK
15
10
1
2,377
25
Schulter
OK
16
10
0
1,890
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What cities have the highest levels of haloacetic?
Our analysis of 2026 data identified the cities with the highest detected levels of haloacetic. See the full ranking above.
Is haloacetic dangerous in drinking water?
Haloacetic has known health risks at elevated levels. The EWG sets health guidelines that are often stricter than EPA legal limits to account for the latest research on long-term exposure.
How do I remove haloacetic from my water?
Reverse osmosis (RO) systems are the most effective at removing a wide range of contaminants. Check the specific contaminant details for recommended filtration technology.
What is the EPA legal limit for haloacetic?
EPA legal limits vary by contaminant and may differ from EWG health guidelines. See individual city reports for specific legal limit comparisons.
Data sources: Environmental Working Group (EWG) Tap Water Database, U.S. EPA Safe Drinking Water Information System (SDWIS)
Last updated: September 2026
Methodology: Contaminant levels are compared against both EPA legal limits (Maximum Contaminant Levels) and EWG health guidelines, which are often stricter and based on the latest scientific research.
