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At EWG, our team of scientists, engineers, policy experts, lawyers and computer programmers pores over government data, legal documents, scientific studies and our own laboratory tests to expose threats to your health and the environment, and to find solutions. Our research brings to light unsettling facts that you have a right to know.

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(Updated Sept. 19, 2011)
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tap water database

States that are doing the most testing

rank	state	years	contaminants tested	total tests completed	total detects
1	California	2004-2009	389 contaminants	1,682,094 tests	202,248 detects
2	New York	2004-2009	298 contaminants	825,911 tests	106,706 detects
3	Missouri	2004-2009	287 contaminants	436,158 tests	79,854 detects
4	Nevada	2004-2008	246 contaminants	41,932 tests	4,309 detects
5	Delaware	2004-2007	233 contaminants	156,940 tests	12,641 detects
6	Illinois	2004-2009	226 contaminants	561,589 tests	140,290 detects
7	New Mexico	2004-2008	225 contaminants	99,476 tests	12,796 detects
8	Texas	2004-2009	214 contaminants	839,279 tests	194,529 detects
9	Alaska	2004-2009	205 contaminants	84,445 tests	12,520 detects
10	Vermont	2004-2009	199 contaminants	67,597 tests	9,878 detects
11	Washington	2004-2008	194 contaminants	361,583 tests	32,038 detects
12	Virginia	2004-2009	192 contaminants	307,796 tests	40,130 detects
13	Minnesota	2004-2010	189 contaminants	263,402 tests	27,619 detects
14	Maine	2004-2009	187 contaminants	118,366 tests	16,175 detects
15	New Jersey	2004-2008	185 contaminants	305,114 tests	49,309 detects
16	Iowa	2004-2009	166 contaminants	132,508 tests	54,708 detects
17	Michigan	2007-2008	165 contaminants	107,209 tests	8,110 detects
18	Arkansas	2004-2009	163 contaminants	317,930 tests	69,578 detects
19	Wisconsin	2004-2008	163 contaminants	335,628 tests	65,380 detects
20	Alabama	2004-2008	162 contaminants	65,516 tests	4,983 detects
21	Rhode Island	2004-2009	160 contaminants	55,050 tests	2,296 detects
22	Florida	2004-2008	160 contaminants	293,991 tests	49,606 detects
23	Arizona	2004-2009	156 contaminants	143,980 tests	13,100 detects
24	Ohio	2004-2009	155 contaminants	254,108 tests	67,259 detects
25	Montana	2004-2009	152 contaminants	136,406 tests	14,729 detects
26	Nebraska	2004-2008	151 contaminants	315,209 tests	23,740 detects
27	New Hampshire	2004-2009	147 contaminants	272,988 tests	24,303 detects
28	Idaho	2004-2009	144 contaminants	68,546 tests	9,422 detects
29	Maryland	2004-2007	141 contaminants	108,867 tests	19,369 detects
30	Massachusetts	2004-2009	140 contaminants	156,943 tests	23,584 detects
31	North Carolina	2004-2009	135 contaminants	808,921 tests	90,729 detects
32	South Carolina	2004-2008	133 contaminants	30,833 tests	1,310 detects
33	Utah	2004-2006	132 contaminants	65,409 tests	8,587 detects
34	Oregon	2004-2009	132 contaminants	120,785 tests	10,690 detects
35	West Virginia	2004-2005	128 contaminants	9,960 tests	77 detects
36	Colorado	2007-2009	118 contaminants	155 tests	21 detects
37	Indiana	2004-2009	113 contaminants	165,950 tests	18,647 detects
38	Wyoming	2004-2008	105 contaminants	29,768 tests	4,262 detects
39	Oklahoma	2004-2009	102 contaminants	91,648 tests	12,667 detects
40	Hawaii	2004-2009	96 contaminants	45,057 tests	2,193 detects
41	North Dakota	2004-2008	95 contaminants	27,600 tests	6,416 detects
42	Pennsylvania	2004-2009	92 contaminants	254,591 tests	41,266 detects
43	Connecticut	2004-2009	90 contaminants	124,978 tests	15,601 detects
44	South Dakota	2004-2009	85 contaminants	35,299 tests	1,205 detects
45	Kentucky	2004-2009	85 contaminants	83,796 tests	9,063 detects
46	District of Columbia	2008-2009	4 contaminants	16 tests	16 detects

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