Purdue Residential Onsite Wastewater Disposal:  Septic system information to protect your family and the environment
 

Wastewater Disposal Data by Indiana County

Onsite wastewater disposal (septic systems) in Indiana

Note: Percent and number of households with onsite wastewater disposal (septic systems)  are from the 1990 Census, which continues to be the most recent information available. The 2000 Census did not ask people about wastewater. Calculations of density are by Jane Frankenberger and Joe Yahner. 

The soil information (last column) is based on National Resources Conservation Service (NRCS) Soil Survey information, calculated by Bill Hostetter, Soil Scientist in the Indiana NRCS State Office. "Severe limitations" are based on NRCS criteria, which are more restrictive than those required by the Indiana State Department of Health.
 

County
Percent of
Households
with Onsite
Wastewater Disposal
(Septics)
Number of Households
with Onsite
Wastewater Disposal
(Septics)
County
Area
(acres)
Density of
Septic
Systems (acres per
septic
system)
Percent of
Area with
Soils Having
"Severe
Limitations" for Septic
Systems
Adams
39%
4,217
217,394
51.6
100
Allen
12%
14,721
422,323
28.7
97
Bartholomew
34%
8,655
262,872
30.4
94
Benton
39%
1,504
261,268
173.7
Blackford
29%
1,715
105,519
61.5
99
Boone
43%
6,206
270,832
43.6
97
Brown
90%
6,317
201,535
31.9
100
Carroll
49%
5,585
239,732
42.9
83
Cass
43%
6,657
265,279
39.8
81
Clark
24%
8,565
240,349
28.1
81
Clay
51%
5,406
230,908
42.7
93
Clinton
34%
4,129
258,182
62.5
97
Crawford
73%
3,202
197,524
61.7
93
Daviess
39%
4,256
278,546
65.4
95
Dearborn
53%
7,675
237,819
31
99
Decatur
47%
4,316
232,636
53.9
98
DeKalb
38%
5,207
195,920
37.6
96
Delaware
22%
10,676
252,505
23.7
Dubois
41%
5,672
277,558
48.9
96
Elkhart
45%
27,249
298,477
11
88
Fayette
32%
3,371
137,730
40.9
61
Floyd
31%
7,915
94,288
11.9
81
Fountain
46%
3,345
252,567
75.5
82
Franklin
68%
4,912
251,333
51.2
98
Fulton
55%
4,775
237,017
49.6
83
Gibson
44%
5,907
319,396
54.1
84
Grant
28%
8,272
265,094
32
100
Greene
52%
6,879
350,373
50.9
94
Hamilton
29%
11,716
257,072
21.9
93
Hancock
55%
9,096
198,573
21.8
97
Harrison
80%
9,214
310,633
33.7
67
Hendricks
55%
14,817
262,749
17.7
96
Henry
43%
8,524
255,282
29.9
95
Howard
27%
9,051
187,466
20.7
95
Huntington
34%
4,689
247,939
52.9
98
Jackson
35%
5,259
328,220
62.4
96
Jasper
59%
5,330
358,395
67.2
97
Jay
41%
3,648
245,039
67.2
96
Jefferson
40%
4,727
231,648
49
92
Jennings
61%
5,594
240,658
43
94
Johnson
30%
9,861
204,436
20.7
94
Knox
36%
6,000
335,316
55.9
62
Kosciusko
66%
20,161
354,075
17.6
82
Lagrange
79%
9,685
247,692
25.6
70
Lake
10%
18,274
396,962
21.7
96
Laporte
43%
18,002
389,865
21.7
74
Lawrence
51%
8,945
290,394
32.5
Madison
30%
15,914
289,345
18.2
99
Marion
10%
34,475
262,502
7.4
97
Marshall
54%
9,064
288,234
31.8
69
Martin
50%
2,052
217,703
106.1
89
Miami
42%
6,161
241,460
39.2
93
Monroe
30%
12,566
262,070
20.9
73
Montgomery
44%
6,092
324,456
53.3
85
Morgan
56%
11,391
261,700
23
89
Newton
72%
3,784
259,849
68.7
98
Noble
50%
7,800
265,958
34.1
87
Ohio
51%
1,093
56,647
51.8
99
Orange
49%
3,811
261,761
68.7
71
Owen
79%
6,327
246,335
38.9
99
Parke
72%
5,190
291,319
56.1
84
Perry
38%
2,807
247,507
88.2
98
Pike
70%
3,822
216,530
56.7
92
Porter
31%
14,444
334,267
23.1
83
Posey
53%
5,523
267,624
48.5
71
Pulaski
75%
4,149
276,016
66.5
98
Putnam
56%
6,137
313,040
51
89
Randolph
45%
5,057
289,221
57.2
97
Ripley
55%
5,297
287,061
54.2
95
Rush
55%
3,839
262,317
68.3
92
Saint Joseph
29%
28,391
294,775
10.4
60
Scott
48%
3,917
124,155
31.7
100
Shelby
51%
7,935
264,723
33.4
96
Spencer
59%
4,511
256,948
57
91
Starke
73%
7,240
197,339
27.3
100
Steuben
65%
10,202
206,102
20.2
84
Sullivan
44%
3,694
287,370
77.8
92
Switzerland
71%
2,638
142,173
53.9
99
Tippecanoe
21%
9,975
323,098
32.4
89
Tipton
54%
3,494
165,807
47.5
100
Union
56%
1,575
105,704
67.1
61
Vanderburgh
12%
8,992
150,936
16.8
94
Vermillion
64%
4,697
167,720
35.7
87
Vigo
29%
12,953
261,329
20.2
94
Wabash
40%
5,419
268,858
49.6
94
Warren
72%
2,366
232,574
98.3
95
Warrick
32%
5,417
249,667
46.1
97
Washington
63%
6,025
329,392
54.7
69
Wayne
28%
8,233
262,625
31.9
87
Wells
47%
4,688
236,955
50.5
100
White
61%
7,294
325,999
44.7
91
Whitley
62%
6,682
216,036
32.3
99
Total
31%
703,032
Average
44.5
90