Chromium-6 Contamination

Chromium-6 in Kentucky 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

0.19 µg/L

State Avg

▼ 0% vs national

vs National

222

Health Violations

Analysis

Chromium-6 in Kentucky: what the data shows

Kentucky has 98 cities with chromium-6 data from the EPA's UCMR 3 program (2013–2015). Hexavalent chromium (Cr VI) was detected in 98 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 0.19 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)

Kentucky

100%

98 of 98 cities

← = Exactly at national rate

National avg

100%

4005 of 4005 cities

City Map

Chromium-6 data across Kentucky

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 Kentucky

Highest Chromium-6 levels (µg/L)

All Cities

All Kentucky cities ranked by chromium-6 level

#	City	Level	Detected?	Violations	Grade
1	Owensboro	1.50 µg/L	Detected	5	A-
2	Knottsville	1.30 µg/L	Detected	4	B+
3	Ft. Campbell	0.86 µg/L	Detected	0	C+
4	Radcliff	0.68 µg/L	Detected	1	A-
5	Horse Cave	0.65 µg/L	Detected	3	A-
6	Grennsburg	0.54 µg/L	Detected	11	A-
7	Bradenburg	0.51 µg/L	Detected	2	A-
8	London	0.40 µg/L	Detected	19	B-
9	Benton	0.40 µg/L	Detected	14	C+
10	Salt Lick	0.40 µg/L	Detected	6	A-
11	Elizabethtown	0.39 µg/L	Detected	3	B+
12	Brownsville	0.37 µg/L	Detected	26	D+
13	Dixon	0.37 µg/L	Detected	29	B-
14	Lexington	0.33 µg/L	Detected	31	B
15	Hopkinsville	0.32 µg/L	Detected	15	A-
16	Flemingsburg	0.28 µg/L	Detected	13	B+
17	Henderson	0.26 µg/L	Detected	7	B
18	Bardwell	0.26 µg/L	Detected	1	A-
19	Georgetown	0.25 µg/L	Detected	3	B+
20	Hartford	0.23 µg/L	Detected	77	C
21	Frankfort	0.21 µg/L	Detected	7	C+
22	Louisville	0.20 µg/L	Detected	7	B+
23	Eubank	0.20 µg/L	Detected	10	A-
24	Ft. Thomas	0.19 µg/L	Detected	0	A-
25	Bowling Green	0.19 µg/L	Detected	16	B
26	Mayfield	0.19 µg/L	Detected	3	C-
27	Greenville	0.19 µg/L	Detected	17	C+
28	Irvine,	0.19 µg/L	Detected	11	B
29	Falmouth	0.19 µg/L	Detected	19	C+
30	Buckner	0.18 µg/L	Detected	3	A
31	Crittenden	0.18 µg/L	Detected	9	A-
32	Lagrange	0.18 µg/L	Detected	0	A-
33	Cynthiana	0.17 µg/L	Detected	29	C+
34	Somerset	0.16 µg/L	Detected	4	B+
35	Coxs Creek	0.16 µg/L	Detected	7	B+
36	Tompkinsville	0.16 µg/L	Detected	19	B-
37	Glasgow	0.15 µg/L	Detected	3	A
38	Leitchfield	0.15 µg/L	Detected	9	A-
39	Bagdad	0.15 µg/L	Detected	1	B+
40	Maysville	0.15 µg/L	Detected	8	B-
41	Liberty	0.15 µg/L	Detected	32	C+
42	Harlan	0.15 µg/L	Detected	2	A
43	Lebanon	0.14 µg/L	Detected	11	A-
44	Scottsville	0.14 µg/L	Detected	5	B+
45	Whitley City	0.13 µg/L	Detected	3	A
46	Shelbyville	0.13 µg/L	Detected	4	A-
47	Lancaster	0.13 µg/L	Detected	13	B+
48	Franklin	0.13 µg/L	Detected	2	A-
49	Paducah	0.12 µg/L	Detected	4	A-
50	Danville	0.12 µg/L	Detected	10	A-
51	Hardinsburg	0.12 µg/L	Detected	29	A-
52	Middlesboro	0.12 µg/L	Detected	1	A-
53	Greensburg	0.12 µg/L	Detected	7	A
54	Monticello	0.11 µg/L	Detected	7	A-
55	Princeton	0.11 µg/L	Detected	15	B+
56	Vicco	0.10 µg/L	Detected	11	B+
57	Catlettsburg	0.10 µg/L	Detected	24	C-
58	Winchester	0.10 µg/L	Detected	25	B+
59	Berea	0.10 µg/L	Detected	30	A-
60	Paris	0.10 µg/L	Detected	39	C+
61	Mt Vernon	0.09 µg/L	Detected	2	A-
62	Bardstown	0.09 µg/L	Detected	13	B+
63	Mt Sterling	0.09 µg/L	Detected	118	D
64	Mt Washington	0.09 µg/L	Detected	1	A-
65	Taylorsville	0.09 µg/L	Detected	1	A-
66	Morehead	0.09 µg/L	Detected	45	C+
67	Burlington	0.08 µg/L	Detected	6	B
68	Richmond	0.08 µg/L	Detected	11	B
69	Florence	0.08 µg/L	Detected	4	A
70	Sedalia	0.08 µg/L	Detected	5	B
71	Paintsville	0.08 µg/L	Detected	10	A-
72	Cadiz	0.08 µg/L	Detected	4	B+
73	Pineville	0.08 µg/L	Detected	14	C+
74	Bloomfield	0.08 µg/L	Detected	13	B
75	Campbellsville	0.08 µg/L	Detected	25	B
76	Salvisa	0.07 µg/L	Detected	7	B+
77	Versailles	0.07 µg/L	Detected	7	B+
78	Ashland	0.07 µg/L	Detected	37	C+
79	Corbin	0.07 µg/L	Detected	9	B
80	Mckee	0.07 µg/L	Detected	60	B-
81	Sharpsburg	0.07 µg/L	Detected	20	B
82	Hazard	0.06 µg/L	Detected	21	B-
83	Mcdoqwell	0.06 µg/L	Detected	26	C+
84	Springfield	0.06 µg/L	Detected	6	A
85	Russell Springs	0.06 µg/L	Detected	10	B+
86	Albany	0.06 µg/L	Detected	21	B-
87	Lynch	0.06 µg/L	Detected	11	C-
88	Harrodsburg	0.06 µg/L	Detected	8	A-
89	Lawrenceburg	0.06 µg/L	Detected	19	B
90	Jamestown	0.06 µg/L	Detected	23	B
91	Inez	0.05 µg/L	Detected	48	B-
92	Fulton	0.05 µg/L	Detected	1	A-
93	Pikeville	0.05 µg/L	Detected	79	D
94	Prestonsburg	0.05 µg/L	Detected	11	A-
95	Manchester	0.04 µg/L	Detected	16	C
96	Barbourville	0.04 µg/L	Detected	10	C+
97	Grayson	0.04 µg/L	Detected	26	B-
98	Nicholasville	0.04 µg/L	Detected	38	C-

FAQ

Frequently asked questions about chromium-6 in Kentucky

Is chromium-6 in Kentucky 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. 98 cities in Kentucky 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 Kentucky 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 Kentucky?

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).

More contaminants