STATE REPORT IN 1 ALERT 909 HEALTH VIOLATIONS

Indiana Water Quality: 5.9K Violations in 980 ZIP Codes

980 ZIP codes · 721 water systems · IPC plumbing code · Updated 2026-06-03

Data: EPA SDWIS, NWS, State plumbing boards, Rewiring America Last verified: 2026-06-03

980
ZIP Codes
721
Water Systems
629
ZIPs with Violations
1
Active Alerts
IPC
Plumbing Code
C · 60
Avg Safety Score
6
ZIPs Exceeding Lead Limit
65%
High Radon Risk (Zone 1)
#42
of 51 States
22%
ZIPs Rated A or B
64%
ZIPs with Violations
C
Indiana average: 60/100 — ranked #42 of 51 states. 7 points below the national average (67). 64% of ZIP codes have recorded violations.

Tap water safety in Indiana is a mixed picture that skews low — a notable share of monitored systems carry unresolved health violation records in the current EPA dataset.

Score Distribution

How Indiana's 980 ZIP codes are distributed across safety grades.

5
A
215
B
401
C
350
D
9
F
85-10070-8455-6940-540-39

Home Safety Scores by State

Loading map…
F (0-49) D (50-64) C (65-74) B (75-84) A (85+)

Data: EPA SDWIS, FEMA NFIP, EPA Radon, USGS Earthquake Hazards, NIFC Wildfire • 2026-06-03

Top 10 Safest ZIP Codes in Indiana

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 46730 CorunnaDeKalb 88 A
2 46361 Michigan CityLaPorte 87 A
3 46390 WanatahLaPorte 87 A
4 46346 Kingsford HeightsLaPorte 86 A
5 46738 GarrettDeKalb 86 A
6 46345 KingsburyLaPorte 83 B
7 46347 KoutsPorter 83 B
8 47006 BatesvilleFranklin 83 B
9 47018 DillsboroDearborn 83 B
10 47119 Floyds KnobsFloyd 83 B

10 Lowest-Scoring ZIP Codes in Indiana

#ZIP CodeCityCountyScoreGradeViolations
1 46538 LeesburgKosciusko 24 F 10
2 46974 RoannWabash 31 F 1
3 46741 GrabillAllen 31 F 5
4 47952 KingmanFountain 33 F 11
5 47355 LynnRandolph 33 F 3
6 47150 New AlbanyClark 35 F 0
7 47451 OoliticLawrence 36 F 15
8 46725 Columbia CityWhitley 38 F 6
9 46733 DecaturAdams 39 F 5
10 47997 YeomanCarroll 40 D 0

County Rankings

Water quality breakdown by county. 92 counties with data in Indiana.

Loading county map…
F (0-49) D (50-64) C (65-74) B (75-84) A (85+)

County-level aggregation of ZIP code safety scores • EPA SDWIS, FEMA NFIP, EPA Radon, USGS, NIFC

CountyAvg ScoreGradeZIPsBest ZIPWorst ZIP
Madison 62 C 16 46051 (69) 46044 (52)
Hamilton 60 C 18 46030 (70) 46280 (51)
Boone 63 C 7 46035 (70) 46102 (55)
Howard 58 C 10 46904 (68) 46995 (40)
Carroll 49 D 12 46917 (70) 47997 (40)
Tipton 53 D 5 46076 (69) 46047 (40)
Clinton 53 D 6 46050 (67) 46067 (40)
Wells 55 C 7 46770 (68) 46798 (40)
Hendricks 57 C 11 46112 (70) 46180 (40)
Rush 60 C 4 46115 (62) 46156 (58)
Putnam 57 C 9 46120 (65) 46170 (40)
Johnson 58 C 7 46184 (68) 46162 (53)
Delaware 62 C 15 47396 (69) 47334 (44)
Shelby 54 D 8 46182 (63) 46144 (40)
Morgan 64 C 8 46113 (81) 47456 (53)
Henry 50 D 17 47356 (70) 47388 (40)
Owen 66 C 6 47868 (82) 47431 (53)
Hancock 53 D 4 46163 (70) 46154 (40)
Fayette 50 D 3 47331 (58) 47322 (40)
Decatur 46 D 6 47240 (60) 47261 (40)
Brown 70 B 5 46160 (82) 47435 (63)
Marion 49 D 60 46202 (56) 46240 (41)
LaPorte 77 B 12 46361 (87) 46374 (50)
Lake 65 C 34 46325 (82) 46408 (50)
Porter 74 B 6 46347 (83) 46380 (53)
Newton 69 C 12 47951 (80) 47964 (53)
Cass 49 D 18 46932 (69) 47926 (40)
Jasper 71 B 4 47978 (77) 46392 (63)
St. Joseph 59 C 27 46530 (69) 46595 (40)
Starke 77 B 3 46366 (81) 46534 (69)
Marshall 52 D 12 46501 (69) 46968 (40)
Kosciusko 52 D 24 46982 (70) 46538 (24)
Elkhart 65 C 13 46573 (70) 46516 (59)
Fulton 55 C 7 46939 (66) 46935 (40)
LaGrange 54 D 9 46746 (65) 46789 (40)
Noble 58 C 8 46755 (68) 46794 (40)
Huntington 47 D 5 46792 (62) 46791 (40)
Steuben 61 C 6 46776 (69) 46779 (45)
Allen 63 C 56 46748 (70) 46741 (31)
DeKalb 76 B 6 46730 (88) 46785 (60)
Adams 53 D 8 46711 (70) 46733 (39)
Whitley 58 C 3 46723 (69) 46725 (38)
Blackford 51 D 5 47348 (62) 46781 (40)
Miami 52 D 6 46914 (70) 46971 (40)
Tippecanoe 55 C 18 47996 (70) 47992 (40)
Grant 56 C 11 46933 (69) 46987 (40)
Wabash 57 C 7 46941 (68) 46974 (31)
Pulaski 77 B 3 47946 (82) 46996 (71)
Dearborn 69 C 8 47018 (83) 47035 (53)
Union 48 D 4 47353 (60) 47325 (40)
Franklin 73 B 6 47006 (83) 47225 (53)
Switzerland 62 C 4 47038 (76) 47011 (53)
Jefferson 70 B 6 47224 (83) 47017 (53)
Ripley 70 B 10 47023 (82) 47263 (53)
Ohio 73 B 1 47040 (73) 47040 (73)
Scott 68 C 2 47102 (68) 47170 (67)
Clark 52 D 22 47141 (66) 47150 (35)
Floyd 69 C 6 47119 (83) 47146 (53)
Washington 59 C 3 47108 (64) 47167 (53)
Harrison 53 D 12 47164 (70) 47160 (40)
Crawford 63 C 12 47123 (82) 47175 (45)
Orange 60 C 5 47452 (66) 47469 (40)
Daviess 71 B 6 47162 (80) 47519 (53)
Bartholomew 53 D 10 47202 (69) 47244 (40)
Jackson 65 C 9 47220 (80) 47264 (53)
Jennings 52 D 8 47265 (68) 47270 (40)
Wayne 53 D 16 47357 (68) 47392 (40)
Randolph 54 D 10 47390 (70) 47355 (33)
Jay 59 C 4 47369 (66) 47381 (40)
Monroe 49 D 13 47434 (66) 47463 (40)
Lawrence 50 D 7 47421 (63) 47451 (36)
Greene 65 C 12 47443 (82) 47845 (53)
Clay 64 C 15 47881 (82) 47871 (53)
Martin 62 C 6 47522 (79) 47457 (53)
Knox 70 B 16 47516 (82) 47869 (53)
Dubois 67 C 14 47545 (83) 47513 (44)
Perry 72 B 5 47520 (82) 47574 (63)
Spencer 68 C 11 47537 (81) 47556 (53)
Pike 77 B 3 47567 (82) 47598 (73)
Warrick 71 B 10 47629 (83) 47654 (53)
Posey 63 C 5 47631 (79) 47633 (40)
Vanderburgh 80 B 37 47701 (83) 47638 (53)
Gibson 72 B 9 47649 (83) 47683 (53)
Vigo 73 B 17 47878 (83) 47876 (53)
Parke 69 C 10 47860 (83) 47862 (50)
Vermillion 53 D 10 47854 (69) 47880 (40)
Sullivan 73 B 8 47855 (83) 47852 (53)
Montgomery 59 C 16 47940 (66) 47968 (40)
Benton 54 D 9 47917 (65) 47986 (40)
Fountain 52 D 7 47932 (70) 47952 (33)
White 54 D 6 47995 (66) 47925 (45)
Warren 58 C 3 47993 (68) 47982 (40)

Most Common Contaminants in Indiana

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Surface Water Treatment Rule Treatment Technique 476 1452 No
Stage 1 DBP Rule Treatment Technique 422 1399 Yes
Consumer Confidence Report Rule Reporting 401 1221 Yes
Stage 2 DBP Rule Treatment Technique 228 708 Yes
Total Trihalomethanes (TTHM) Disinfection Byproducts 182 286 Yes
Radium-228 Radionuclides 135 136 No
Haloacetic Acids (HAA5) Disinfection Byproducts 85 211 Yes
Lead and Copper Rule Treatment Technique 71 71 No

Overview

We track water quality, weather alerts, plumbing regulations, and energy rebates for 980 ZIP codes across Indiana, covering 721 community water systems that serve approximately 4,720,541 people.

629 of 980 ZIP codes (64%) have recorded EPA violations. 909 health-based violations have been documented.

Active Weather Alerts

1 active alert in Indiana including 1 warning. Severe weather can directly affect tap water quality — flooding, power outages, and infrastructure damage may lead to boil-water advisories.

Alert Severity Areas
Flood Warning Severe Gibson, IN; Knox, IN

View all Indiana alerts →

Plumbing Regulations

Indiana follows the Indiana Plumbing Code (based on IPC) (2020 edition).

  • Plumbing code: IPC (2020)
  • Homeowner DIY: Licensed plumber required
  • Water heater permit: Required
  • Annual backflow test: Required

Full Indiana regulations →

Areas with Most Violations

ZIP Code City Safety Score Violations Health-Based System
46350 La Porte B 53 2 Westville Water Department
46352 La Porte B 53 2 Shady Grove Mobile Home Park
47130 Jeffersonville D 50 6 Indiana American Water - S. Indiana
47131 Jeffersonville C 50 6 Indiana American Water - S. Indiana
47132 Jeffersonville C 50 6 Indiana American Water - S. Indiana
47133 Jeffersonville C 50 6 Indiana American Water - S. Indiana
47134 Jeffersonville C 50 6 Indiana American Water - S. Indiana
47144 Jeffersonville C 50 6 Indiana American Water - S. Indiana
47190 Jeffersonville C 50 6 Indiana American Water - S. Indiana
47199 Jeffersonville C 50 6 Indiana American Water - S. Indiana

Areas with No Violations

ZIP Code City Safety Score System Population
46030 Arcadia B Arcadia Water Department 1,515
46035 Colfax B Colfax Water Company 690
46039 Forest D INDIANA AMERICAN WATER - RUSSIAVILLE 1,178
46045 Goldsmith D TIPTON UTILITY SERVICE B 5,200
46047 Hobbs D TIPTON UTILITY SERVICE B 5,200
46048 Ingalls C Citizens Water of Westfield Llc 65
46049 Kempton D KIRKLIN WATER DEPARTMENT 788
46055 Mc Cordsville D CITIZENS WATER - INDIANAPOLIS 880,345
46056 Markleville D ANDERSON WATER DEPARTMENT 58,942
46057 Michigantown D FRANKFORT WATER WORKS 16,422

Home Safety Score

Average Home Safety Score for Indiana: C (60/100)

Lead & Copper

  • Average lead level (90th percentile): 0.0033 mg/L (EPA action level: 0.015 mg/L)
  • 6 ZIP codes exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 635 ZIP codes (65%)
  • Moderate risk (Zone 2): 327 ZIP codes
  • Low risk (Zone 3): 0 ZIP codes

ZIP Code Reports for Indiana

Largest Communities

ZIP Code City Population Safety Grade Violations
46143 Greenwood 1,467,126 D 11
46142 Greenwood 1,458,326 D 11
46240 Indianapolis 1,099,630 D 26
46260 Indianapolis 1,099,630 D 26
46268 Indianapolis 1,099,630 D 26
46280 Indianapolis 1,099,630 D 26
46290 Indianapolis 1,099,630 C 26
46217 Indianapolis 1,086,516 D 26
46227 Indianapolis 1,086,516 D 26
46237 Indianapolis 1,086,516 D 26
46259 Indianapolis 1,086,516 D 26
46077 Zionsville 1,047,987 C 2
46032 Carmel 1,042,273 C 12
46033 Carmel 1,042,273 C 12
46074 Westfield 1,042,032 C 3
46231 Indianapolis 1,037,258 C 26
46234 Indianapolis 1,023,453 D 26
46278 Indianapolis 1,023,453 C 26
46256 Indianapolis 1,007,341 D 26
46201 Indianapolis 999,703 D 26

Lowest Safety Scores

ZIP Code City Score Grade Violations
46538 Leesburg 24 F 10
46741 Grabill 31 F 5
46974 Roann 31 F 1
47355 Lynn 33 F 3
47952 Kingman 33 F 11

Highest Safety Scores

ZIP Code City Score Grade Violations
46730 Corunna 88 A 1
46361 Michigan City 87 A 13
46390 Wanatah 87 A 2
46346 Kingsford Heights 86 A 1
46738 Garrett 86 A 4

All 980 ZIP Codes in Indiana

Data Sources

Updated daily.

Frequently Asked Questions

Is the water safe to drink in Indiana?

Indiana has 721 community water systems serving 4,720,541 people across 980 ZIP codes. There are 5,914 recorded violations, including 909 health-based. 629 of 980 ZIP codes have at least one violation.

What plumbing code does Indiana follow?

Indiana follows the IPC plumbing code. A licensed plumber is generally required for plumbing work.

Is lead a concern in Indiana's drinking water?

6 ZIP codes in Indiana have lead levels exceeding the EPA action level of 0.015 mg/L.

What is the radon risk in Indiana?

65% of ZIP codes in Indiana fall in EPA Radon Zone 1 (highest risk).

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