HAA5 Contamination

HAA5 in Arkansas Drinking Water

Ranked by average HAA5 concentration (µg/L) · UCMR 4 data (2018–2020) · Data from EPA SDWIS & UCMR

Cities Tested

Exceeds Limit

% Exceeds Limit

20.2 µg/L

State Avg

▼ 1% vs national

vs National

311

Health Violations

Analysis

HAA5 in Arkansas: what the data shows

Arkansas has 60 cities with HAA5 monitoring data from the EPA's UCMR 4 program (2018–2020). Haloacetic acids (HAA5) form when chlorine-based disinfectants react with natural organic matter in water. The state average is 20.2 µg/L — better than the 15.5 µg/L national average. No cities currently exceed the 60 µg/L EPA MCL. HAA5 is a group of five chlorinated and brominated acetic acids. Long-term exposure above the MCL is associated with increased cancer risk and adverse reproductive outcomes. The EPA classifies total HAA5 as a probable human carcinogen at elevated concentrations. Activated carbon filtration (especially granular or block carbon) is effective at reducing HAA5. Running water through a refrigerator filter or letting it sit in an open pitcher for 30 minutes also helps, as some HAA5 species are volatile. Boiling does not remove disinfection byproducts and may concentrate them.

Comparison

Cities exceeding 60 µg/L EPA MCL

Arkansas

0 of 60 cities

← ▼ 1% below national rate (better)

National avg

23 of 4420 cities

City Map

HAA5 data across Arkansas

Each dot is a city with UCMR 4 HAA5 testing data. Cities where average HAA5 exceeded the 60 µg/L EPA MCL are highlighted. Size reflects population served.

Worst Offenders

Top 10 cities by haa5 level in Arkansas

Highest HAA5 levels (µg/L)

All Cities

All Arkansas cities ranked by haa5 level

#	City	Level	Exceeds?	Violations	Grade
1	Texarkana	47.2 µg/L	No	25	B+
2	Russellville	46.0 µg/L	No	25	C-
3	Centerton	41.7 µg/L	No	4	A
4	Farmington	41.3 µg/L	No	15	B+
5	Bella Vista	36.6 µg/L	No	13	B+
6	Dardanelle	36.3 µg/L	No	36	C+
7	Bentonville	36.0 µg/L	No	2	A-
8	Russelville	35.7 µg/L	No	11	A-
9	Rogers	35.6 µg/L	No	17	B-
10	Hot Springs Village	34.9 µg/L	No	0	A+
11	Hot Springs	34.7 µg/L	No	43	B+
12	Springdale	34.1 µg/L	No	2	B
13	Greers Ferry	33.3 µg/L	No	6	A
14	Mountain Home	31.0 µg/L	No	22	B+
15	Malvern	30.7 µg/L	No	19	B+
16	Camden	29.9 µg/L	No	126	D
17	Tumbling Shoals	29.9 µg/L	No	1	A-
18	Fayetteville	28.5 µg/L	No	17	D
19	Hope	28.1 µg/L	No	57	F
20	Conway	26.9 µg/L	No	14	B
21	Arkadelphia	26.8 µg/L	No	5	B+
22	Jacksonville	26.3 µg/L	No	7	A+
23	Prairie Grove	26.3 µg/L	No	11	A-
24	Siloam Springs	25.6 µg/L	No	49	F
25	Heber Springs	25.3 µg/L	No	2	A
26	Harrison	23.6 µg/L	No	14	B+
27	Searcy	23.5 µg/L	No	2	A-
28	Vilonia	23.1 µg/L	No	2	A
29	Little Rock	22.5 µg/L	No	44	C+
30	Bald Knob	22.3 µg/L	No	11	A-
31	Batesville	22.1 µg/L	No	65	D+
32	Grannis	21.7 µg/L	No	0	A
33	Benton	21.2 µg/L	No	10	A
34	Morrilton	20.8 µg/L	No	7	B+
35	Van Buren	20.4 µg/L	No	16	C+
36	Fort Smith	16.6 µg/L	No	19	D
37	Waldron	16.3 µg/L	No	38	A
38	Greenwood	16.0 µg/L	No	93	D+
39	Bryant	15.8 µg/L	No	6	A+
40	Des Arc	15.8 µg/L	No	11	A-
41	Cabot	13.5 µg/L	No	6	A
42	Magnolia	12.1 µg/L	No	32	C+
43	Junction City	6.9 µg/L	No	53	D
44	Mabelvale	5.9 µg/L	No	0	A-
45	Swifton	5.8 µg/L	No	17	C-
46	El Dorado	5.2 µg/L	No	77	D
47	Marion	4.7 µg/L	No	11	C
48	Paragould	4.3 µg/L	No	6	A
49	Ash Flat	3.8 µg/L	No	1	A-
50	Monticello	3.2 µg/L	No	31	C-
51	Stuttgart	2.6 µg/L	No	15	A-
52	Poplar Grove	2.6 µg/L	No	2	A+
53	West Memphis	2.5 µg/L	No	12	A
54	Austin	2.1 µg/L	No	1	B
55	Forrest City	2.0 µg/L	No	4	A
56	Blytheville	1.6 µg/L	No	8	C
57	Piggott	1.6 µg/L	No	29	C+
58	Jonesboro	1.4 µg/L	No	2	A+
59	Redfield	1.1 µg/L	No	1	A-
60	Pine Bluff	0.4 µg/L	No	5	A-

FAQ

Frequently asked questions about haa5 in Arkansas

What is HAA5 and why does it appear in Arkansas tap water?

HAA5 (haloacetic acids) are disinfection byproducts that form when chlorine reacts with naturally occurring organic matter in source water. They are a normal byproduct of the disinfection process that makes water safe to drink. No cities in Arkansas currently exceed the 60 µg/L EPA MCL. The state average is 20.2 µg/L.

How can I reduce HAA5 exposure from Arkansas drinking water?

Activated carbon filters (granular or block) effectively reduce HAA5. Refrigerator filters and under-sink carbon systems are convenient options. Unlike lead or PFAS, HAA5 levels can also be reduced by letting water stand in an open container, as some species evaporate. Boiling does NOT remove HAA5 and can concentrate them by reducing water volume.

Which Arkansas cities have the highest HAA5 levels?

The cities with the highest average HAA5 concentrations in Arkansas are: Texarkana (47.2 µg/L), Russellville (46.0 µg/L), Centerton (41.7 µg/L), Farmington (41.3 µg/L), Bella Vista (36.6 µg/L). Note: this data is from UCMR 4 testing (2018–2020) and may not reflect current levels.

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