Chromium-6 Contamination

Chromium-6 in Arkansas Drinking Water

Ranked by max chromium-6 detected (µg/L) · UCMR 3 data (2013–2015) · Data from EPA SDWIS & UCMR

Cities Tested

Detected

100%

% Detected

0.47 µg/L

State Avg

▼ 0% vs national

vs National

311

Health Violations

Analysis

Chromium-6 in Arkansas: what the data shows

Arkansas has 49 cities with chromium-6 data from the EPA's UCMR 3 program (2013–2015). Hexavalent chromium (Cr VI) was detected in 49 of those cities. There is currently no federal MCL for chromium-6 — California's 10 µg/L limit is used as a reference. The state average max detected level is 0.47 µg/L. Chromium-6 occurs naturally in some groundwater aquifers but also from industrial discharge, particularly from steel processing, chrome plating, and leather tanning. It is distinct from trivalent chromium (Cr III), which is an essential nutrient at low doses. The National Toxicology Program and IARC classify chromium-6 as a carcinogen via inhalation; the evidence for drinking water carcinogenicity is strong but regulatory action at the federal level remains pending as of 2026. Reverse osmosis systems effectively remove chromium-6 to near-undetectable levels.

Comparison

Cities exceeding No federal MCL (CA: 10 µg/L)

Arkansas

100%

49 of 49 cities

← = Exactly at national rate

National avg

100%

4005 of 4005 cities

City Map

Chromium-6 data across Arkansas

Each dot is a city with UCMR 3 chromium-6 data. Detected cities are shown; there is no federal MCL — California's 10 µg/L limit is used as a reference. Size reflects population served.

Worst Offenders

Top 10 cities by chromium-6 level in Arkansas

Highest Chromium-6 levels (µg/L)

All Cities

All Arkansas cities ranked by chromium-6 level

#	City	Level	Detected?	Violations	Grade
1	Palestine	3.51 µg/L	Detected	0	A
2	Cabot	3.31 µg/L	Detected	6	A
3	Forrest City	3.13 µg/L	Detected	4	A
4	Hickory Ridge	2.07 µg/L	Detected	14	B
5	Beebe	1.90 µg/L	Detected	1	A-
6	Greenwood	1.26 µg/L	Detected	93	D+
7	Jonesboro	1.19 µg/L	Detected	2	A+
8	Magnolia	0.69 µg/L	Detected	32	C+
9	Jacksonville	0.44 µg/L	Detected	7	A+
10	Hope	0.27 µg/L	Detected	57	F
11	Fort Smith	0.26 µg/L	Detected	19	D
12	Siloam Springs	0.26 µg/L	Detected	49	F
13	Searcy	0.24 µg/L	Detected	2	A-
14	Fayetteville	0.23 µg/L	Detected	17	D
15	Mountain Home	0.21 µg/L	Detected	22	B+
16	Bentonville	0.21 µg/L	Detected	2	A-
17	Bella Vista	0.21 µg/L	Detected	13	B+
18	Van Buren	0.20 µg/L	Detected	16	C+
19	Rogers	0.19 µg/L	Detected	17	B-
20	Texarkana	0.19 µg/L	Detected	25	B+
21	Conway	0.19 µg/L	Detected	14	B
22	Springdale	0.18 µg/L	Detected	2	B
23	Vilonia	0.17 µg/L	Detected	2	A
24	Paragould	0.14 µg/L	Detected	6	A
25	Lincoln	0.14 µg/L	Detected	5	A+
26	Camden	0.13 µg/L	Detected	126	D
27	Rosston	0.13 µg/L	Detected	44	D
28	Mabelvale	0.13 µg/L	Detected	0	A-
29	Batesville	0.13 µg/L	Detected	65	D+
30	Benton	0.12 µg/L	Detected	10	A
31	Hot Springs	0.11 µg/L	Detected	43	B+
32	Farmington	0.11 µg/L	Detected	15	B+
33	Little Rock	0.10 µg/L	Detected	44	C+
34	Centerton	0.10 µg/L	Detected	4	A
35	Bryant	0.10 µg/L	Detected	6	A+
36	Blytheville	0.10 µg/L	Detected	8	C
37	Russelville	0.10 µg/L	Detected	11	A-
38	Central City	0.09 µg/L	Detected	6	A
39	Hot Springs Village	0.08 µg/L	Detected	0	A+
40	Malvern	0.07 µg/L	Detected	19	B+
41	Arkadelphia	0.07 µg/L	Detected	5	B+
42	Russellville	0.07 µg/L	Detected	25	C-
43	El Dorado	0.06 µg/L	Detected	77	D
44	Heber Springs	0.06 µg/L	Detected	2	A
45	Harrison	0.04 µg/L	Detected	14	B+
46	Green Forest	0.04 µg/L	Detected	1	A+
47	West Memphis	0.04 µg/L	Detected	12	A
48	Morrilton	0.04 µg/L	Detected	7	B+
49	Greers Ferry	0.04 µg/L	Detected	6	A

FAQ

Frequently asked questions about chromium-6 in Arkansas

Is chromium-6 in Arkansas tap water dangerous?

Chromium-6 (hexavalent chromium) is a potential human carcinogen. There is currently no federal MCL — California's 10 µg/L limit is the most protective US standard. 49 cities in Arkansas had detectable chromium-6 in UCMR 3 testing (2013–2015). Reverse osmosis is the most effective removal method.

Where does chromium-6 come from in Arkansas water?

Chromium-6 enters water supplies from two main sources: natural weathering of chromium-containing rock formations (especially in the Southwest and parts of the Midwest) and industrial discharge from steel mills, chrome plating, and coal ash sites. Groundwater systems are more commonly affected by natural sources, while surface water systems near industrial areas face pollution-related risks.

How can I filter chromium-6 from my water in Arkansas?

Reverse osmosis (RO) systems are the most effective, removing over 95% of chromium-6. Some high-quality activated alumina or anion exchange filters also provide significant reduction. Standard carbon filters and pitcher filters are generally NOT effective against chromium-6. Look for filters certified by NSF International against NSF/ANSI 58 (for RO systems).

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