B70/100

South Dakota Tap Water Quality Rankings 2026

85 cities · 826,874 people served

Top Contaminant Concerns

Copper (90th percentile)PFOSLead (90th percentile)

All Cities in South Dakota

#	City	Score	Population	Violations
1	Sioux Falls	A (86)	222,427	6
2	Rapid City	B (62)	85,817	40
3	Aberdeen	C (44)	48,739	42
4	Watertown	A (89)	27,242	8
5	Brookings	A (88)	23,377	5
6	Pine Ridge	C (45)	21,439	204
7	Mitchell	B (65)	19,136	39
8	Dell Rapids	A (87)	17,068	11
9	Yankton	F (0)	15,411	32
10	Huron	A (89)	14,263	4
11	Pierre	A (80)	14,091	6
12	Box Elder	F (0)	14,000	144
13	Rosebud	D (22)	13,560	200
14	Tabor	B (78)	13,320	7
15	Miller	A (87)	13,182	12
16	Spearfish	A (89)	12,193	8
17	Arlington	A (94)	12,058	6
18	Vermillion	A (95)	11,695	2
19	Brandon	B (70)	11,048	19
20	Harrisburg	A (90)	10,297	7
21	Ellsworth Afb	B (75)	9,100	6
22	Milbank	A (86)	8,594	6
23	Winner	C (54)	7,781	69
24	Beresford	A (80)	7,609	33
25	Tea	A (83)	7,381	10
26	Murdo	A (96)	7,212	2
27	Sturgis	B (68)	7,020	29
28	Britton	B (71)	6,888	36
29	Lake Andes	A (92)	6,248	5
30	Wakonda	C (44)	6,227	162
31	Toronto	A (92)	6,200	5
32	Madison	D (26)	6,191	35
33	Eagle Butte	D (32)	6,190	90
34	Egan	A (86)	5,800	3
35	Belle Fourche	F (0)	5,617	113
36	Parker	B (63)	5,275	47
37	Black Hawk	D (25)	4,500	56
38	Dakota Dunes	A (86)	3,700	3
39	Clark	B (72)	3,473	41
40	Hartford	A (80)	3,396	13
41	Hot Springs	A (94)	3,395	3
42	Mobridge	B (68)	3,261	21
43	Canton	B (66)	3,066	31
44	North Sioux City	B (63)	3,042	34
45	Lead	A (93)	2,982	4
46	Kimball	D (35)	2,750	42
47	Batesland	A (100)	2,700	0
48	Emery	A (88)	2,685	4
49	Lennox	A (81)	2,571	8
50	Sisseton	A (92)	2,479	5
51	Chamberlain	D (37)	2,473	24
52	Flandreau	B (67)	2,372	10
53	Volga	A (82)	2,340	7
54	Redfield	A (94)	2,214	3
55	Elk Point	C (52)	2,124	41
56	Fort Pierre	C (58)	2,115	15
57	Lower Brule	F (0)	2,108	97
58	Springfield	D (25)	2,108	24
59	Custer	C (50)	1,919	39
60	Webster	A (83)	1,696	6
61	Parkston	B (61)	1,567	20
62	Martin	F (16)	1,500	53
63	Mission	B (75)	1,500	14
64	Wagner	B (78)	1,490	7
65	Newell	F (0)	1,481	35
66	Groton	A (91)	1,380	6
67	Crooks	C (49)	1,362	48
68	Fort Thompson	F (0)	1,357	152
69	Freeman	B (76)	1,329	13
70	Salem	D (30)	1,325	34
71	Baltic	B (61)	1,271	32
72	Platte	B (66)	1,256	11
73	Garretson	F (0)	1,228	66
74	Gregory	C (55)	1,221	34
75	Clear Lake	A (93)	1,218	4
76	Aurora	B (72)	1,200	13
77	Agency Village	B (68)	1,180	25
78	Philip	A (100)	1,170	0
79	Gettysburg	A (88)	1,162	9
80	Deadwood	A (85)	1,156	12
81	Lemmon	B (65)	1,156	31
82	Piedmont	A (83)	1,075	6
83	Oral	D (21)	1,057	64
84	De Smet	D (20)	1,056	53
85	Tyndall	A (85)	1,012	4