STATE REPORT MO 2 ALERTS HEALTH VIOLATIONS: 168

Missouri Home Safety Profiles by ZIP

1161 ZIP codes · 580 water systems · IPC plumbing code

Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData, NWS, State plumbing boards, Rewiring America

ZipCheckup tracks drinking-water and home-safety data for 1,161 ZIP codes across Missouri, covering 580 public water systems that serve about 4,840,321 people. 742 ZIP codes are mapped to at least one water system with an EPA violation on record.

1161
ZIP Codes
580
Water Systems
742
ZIPs with Violations
2
Active Alerts
IPC
Plumbing Code
B · 71
Avg Safety Score
2
ZIPs Mapped to a System Above the Lead Action Level
17%
EPA Radon Zone 1 (county-level potential)
#26
of 50 States
53%
ZIPs Rated A or B
87%
ZIPs with Violations
B
Missouri average: 71/100 - ranked #26 of 50 states. 2 points below the national average (73). Water systems mapped to 87% of ZIP codes have recorded violations.

Across Missouri, ZIP-level Home Safety Scores average out to the top two grade bands; that composite is not a statewide water test.

Score Distribution

How Missouri's 1161 ZIP codes are distributed across safety grades.

0
A
133
B
110
C
6
D
0
F
85-10070-8455-6940-540-39

Home Safety Scores by State

Loading map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

Model 4.0.0 inputs: EPA SDWIS, UCMR5 PFAS, EPA radon zones, annual county AQI •

Top 10 ZIP Codes by Home Safety Score in Missouri

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 63010 ArnoldJefferson 83 B
2 63011 BallwinSt. Louis 83 B
3 63017 ChesterfieldSt. Louis 83 B
4 63031 FlorissantSt. Louis 83 B
5 63033 FlorissantSt. Louis 83 B
6 63034 FlorissantSt. Louis 83 B
7 63040 GroverSt. Louis 83 B
8 63042 HazelwoodSt. Louis 83 B
9 63043 Maryland HeightsSt. Louis 83 B
10 63044 BridgetonSt. Louis 83 B

10 Lowest-Scoring ZIP Codes in Missouri

#ZIP CodeCityCountyScoreGradeViolations
1 64068 LibertyClay 50 D 36
2 64024 Excelsior SpringsClay 50 D 37
3 64012 BeltonCass 50 D 25
4 64078 PeculiarCass 51 D 21
5 64089 SmithvilleClay 53 D 20
6 64157 Kansas CityClay 54 D 29
7 64465 LathropClinton 55 C 18
8 64156 Kansas CityClay 55 C 26
9 64734 ClevelandCass 56 C 19
10 64701 HarrisonvilleCass 56 C 20

County Rankings

Water quality breakdown by county. 115 counties with data in Missouri.

Loading county map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

County-level aggregation of measured ZIP Home Safety Scores • EPA SDWIS, UCMR 5 PFAS, EPA radon zones, EPA AirData

CountyAvg ScoreGradeZIPsBest ZIPWorst ZIP
29001 N/A N/A 4 N/A N/A
29003 64 C 8 64480 (67) 64485 (61)
29005 N/A N/A 5 N/A N/A
29007 N/A N/A 8 N/A N/A
29009 N/A N/A 10 N/A N/A
29011 N/A N/A 5 N/A N/A
29013 N/A N/A 9 N/A N/A
29015 N/A N/A 5 N/A N/A
29017 N/A N/A 9 N/A N/A
29019 80 B 17 65010 (82) 65255 (77)
29021 64 C 13 64506 (66) 64507 (63)
29023 N/A N/A 10 N/A N/A
29025 N/A N/A 7 N/A N/A
29027 83 B 13 63388 (83) 65262 (82)
29029 N/A N/A 11 N/A N/A
29031 N/A N/A 15 N/A N/A
29033 N/A N/A 9 N/A N/A
29035 N/A N/A 4 N/A N/A
29037 59 C 13 64739 (65) 64012 (50)
29039 77 B 4 64756 (78) 64744 (75)
29041 N/A N/A 8 N/A N/A
29043 N/A N/A 11 N/A N/A
29045 N/A N/A 7 N/A N/A
29047 60 C 25 64165 (65) 64068 (50)
29049 59 C 5 64454 (62) 64465 (55)
29051 N/A N/A 14 N/A N/A
29053 N/A N/A 6 N/A N/A
29055 N/A N/A 8 N/A N/A
29057 N/A N/A 6 N/A N/A
29059 N/A N/A 7 N/A N/A
29061 N/A N/A 7 N/A N/A
29063 N/A N/A 8 N/A N/A
29065 N/A N/A 5 N/A N/A
29067 N/A N/A 4 N/A N/A
29069 N/A N/A 10 N/A N/A
29071 N/A N/A 20 N/A N/A
29073 N/A N/A 6 N/A N/A
29075 N/A N/A 5 N/A N/A
29077 64 C 26 65781 (65) 65742 (61)
29079 N/A N/A 4 N/A N/A
29081 N/A N/A 8 N/A N/A
29083 N/A N/A 6 N/A N/A
29085 N/A N/A 7 N/A N/A
29087 N/A N/A 7 N/A N/A
29089 N/A N/A 5 N/A N/A
29091 N/A N/A 9 N/A N/A
29093 N/A N/A 9 N/A N/A
29095 63 C 76 64058 (67) 64086 (58)
29097 76 B 18 64832 (81) 64836 (71)
29099 79 B 18 63010 (83) 63028 (73)
29101 N/A N/A 8 N/A N/A
29103 N/A N/A 6 N/A N/A
29105 N/A N/A 6 N/A N/A
29107 N/A N/A 12 N/A N/A
29109 N/A N/A 9 N/A N/A
29111 N/A N/A 8 N/A N/A
29113 78 B 10 63341 (83) 63343 (74)
29115 N/A N/A 9 N/A N/A
29117 N/A N/A 7 N/A N/A
29119 N/A N/A 10 N/A N/A
29121 N/A N/A 10 N/A N/A
29123 N/A N/A 2 N/A N/A
29125 N/A N/A 4 N/A N/A
29127 N/A N/A 4 N/A N/A
29129 N/A N/A 3 N/A N/A
29131 N/A N/A 9 N/A N/A
29133 N/A N/A 5 N/A N/A
29135 N/A N/A 9 N/A N/A
29137 81 B 6 65258 (82) 63456 (80)
29139 N/A N/A 8 N/A N/A
29141 N/A N/A 8 N/A N/A
29143 N/A N/A 12 N/A N/A
29145 N/A N/A 11 N/A N/A
29147 N/A N/A 14 N/A N/A
29149 N/A N/A 5 N/A N/A
29151 N/A N/A 11 N/A N/A
29153 N/A N/A 15 N/A N/A
29155 N/A N/A 11 N/A N/A
29157 80 B 9 63462 (81) 63775 (79)
29159 N/A N/A 7 N/A N/A
29161 N/A N/A 7 N/A N/A
29163 N/A N/A 8 N/A N/A
29165 N/A N/A 16 N/A N/A
29167 N/A N/A 11 N/A N/A
29169 N/A N/A 10 N/A N/A
29171 N/A N/A 5 N/A N/A
29173 N/A N/A 3 N/A N/A
29175 N/A N/A 8 N/A N/A
29177 N/A N/A 7 N/A N/A
29179 N/A N/A 8 N/A N/A
29181 N/A N/A 6 N/A N/A
29183 70 B 20 63141 (83) 63366 (60)
29185 N/A N/A 6 N/A N/A
29186 81 B 3 63673 (82) 63670 (80)
29187 N/A N/A 9 N/A N/A
29189 81 B 56 63011 (83) 63049 (76)
29195 N/A N/A 11 N/A N/A
29197 N/A N/A 6 N/A N/A
29199 N/A N/A 5 N/A N/A
29201 N/A N/A 11 N/A N/A
29203 N/A N/A 4 N/A N/A
29205 N/A N/A 8 N/A N/A
29207 N/A N/A 11 N/A N/A
29209 N/A N/A 12 N/A N/A
29211 N/A N/A 8 N/A N/A
29213 78 B 18 65731 (82) 65616 (68)
29215 N/A N/A 15 N/A N/A
29217 N/A N/A 11 N/A N/A
29219 N/A N/A 5 N/A N/A
29221 N/A N/A 8 N/A N/A
29223 N/A N/A 12 N/A N/A
29225 N/A N/A 5 N/A N/A
29227 N/A N/A 5 N/A N/A
29229 N/A N/A 6 N/A N/A
29510 70 B 34 63101 (70) 63155 (70)

Most Common Contaminants in Missouri

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Stage 2 DBP Rule Treatment Technique 559 1088 No
Consumer Confidence Report Rule Reporting 448 1071 Yes
Stage 1 DBP Rule Treatment Technique 423 688 No
Surface Water Treatment Rule Treatment Technique 269 467 No
Haloacetic Acids (HAA5) Disinfection Byproducts 219 442 Yes
Lead and Copper Rule Treatment Technique 206 285 No
Total Trihalomethanes (TTHM) Disinfection Byproducts 180 312 Yes
Contaminant 0700 Other 159 368 Yes

Overview

We track multi-source home safety signals for 1161 ZIP records across Missouri. Home Safety Score model 4.0.0 is published for 249 scored records; missing required evidence suppresses the score.

The EPA snapshots used for this build directly map water systems to 850 ZIP records, covering 580 community water systems that serve approximately 4,840,321 people.

742 of 850 ZIP codes with a reported violation count in the available EPA record (87%) have recorded EPA violations. 168 health-based violations appear in the available health breakdown.

Active Weather Alerts

2 active alerts in Missouri. Severe weather can affect household safety and utilities through flooding, power outages, infrastructure damage, and boil-water advisories.

Alert Severity Areas
Flood Watch Severe Bourbon; Crawford; Cherokee; Benton; Morgan; Miller; Vernon; St. Clair; Hickory; Camden; Barton; Cedar; Polk; Dallas; Jasper; Dade
Flood Watch Severe Linn; Bates; Henry

View all Missouri alerts →

Plumbing Regulations

Missouri follows the International Plumbing Code (2018 edition).

  • Plumbing code: IPC (2018)
  • Homeowner DIY: Licensed plumber required
  • Water heater permit: Required
  • Annual backflow test: Required

Full Missouri regulations →

Areas with Most Violations

ZIP Code City Home Safety Grade Violations Health-Based System
65747 Shell Knob — 103 0 Mo Ark Water Company
65681 Lampe — 97 0 Mo Ark Water Company
65611 Blue Eye — 93 0 Longview Subdivision
63857 Kennett — 92 3 Kennett Public Water System
65441 Bourbon — 89 0 Sullivan Public Water System
63357 Marthasville — 57 1 St Charles County Pwsd 2 Dutzow
63049 High Ridge B 49 1 Jefferson County Pwsd 2
63876 Senath — 44 2 Senath Public Water System
63966 Wappapello — 44 0 Wayne & Butler County Pwsd 4
63740 Chaffee — 42 4 Chaffee Public Water System

Areas with No Violations

ZIP Code City Home Safety Grade System Population
63017 Chesterfield B Mo American St Louis St Charles Counties 1,111,000
63031 Florissant B Mo American St Louis St Charles Counties 1,111,000
63033 Florissant B Mo American St Louis St Charles Counties 1,111,000
63034 Florissant B Mo American St Louis St Charles Counties 1,111,000
63042 Hazelwood B Mo American St Louis St Charles Counties 1,111,000
63043 Maryland Heights B Mo American St Louis St Charles Counties 1,111,000
63044 Bridgeton B Mo American St Louis St Charles Counties 1,111,000
63045 Earth City B Mo American St Louis St Charles Counties 1,111,000
63074 Saint Ann B Mo American St Louis St Charles Counties 1,111,000
63079 Stanton — Sullivan Public Water System 7,081

Home Safety Score

Average Home Safety Score for Missouri: B (71/100) across 249 scored of 1161 tracked ZIP records.

Model 4.0.0 uses the canonical components water-compliance, pfas-mcl-screen, radon-zone, annual-aqi across 3 required domains. The sections below provide additional context and do not change that score. Missing required evidence suppresses the score, and a favorable result is not a property-level safety certification.

Lead & Copper

  • Average of reported 90th-percentile lead results: 0.0033 mg/L (EPA action level: 0.015 mg/L)
  • 2 of 850 ZIP codes with known status exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 201 ZIP codes (17%)
  • Moderate risk (Zone 2): 878 ZIP codes
  • Low risk (Zone 3): 72 ZIP codes

ZIP Code Reports for Missouri

Largest Communities

ZIP Code City Population Safety Grade Violations
63119 Saint Louis 1,443,709 B 8
63366 O Fallon 1,419,172 C 10
63105 Saint Louis 1,415,709 B 8
63109 Saint Louis 1,415,709 B 8
63112 Saint Louis 1,415,709 B 8
63115 Saint Louis 1,415,709 B 8
63116 Saint Louis 1,415,709 B 8
63117 Saint Louis 1,415,709 B 8
63120 Saint Louis 1,415,709 B 8
63121 Saint Louis 1,415,709 B 8
63123 Saint Louis 1,415,709 B 8
63125 Saint Louis 1,415,709 B 8
63130 Saint Louis 1,415,709 B 8
63133 Saint Louis 1,415,709 B 8
63136 Saint Louis 1,415,709 B 8
63137 Saint Louis 1,415,709 B 8
63138 Saint Louis 1,415,709 B 8
63139 Saint Louis 1,415,709 B 8
63143 Saint Louis 1,415,709 B 8
63147 Saint Louis 1,415,709 B 8

Lowest Published Home Safety Scores

ZIP Code City Score Grade Violations
64012 Belton 50 D 25
64024 Excelsior Springs 50 D 37
64068 Liberty 50 D 36
64078 Peculiar 51 D 21
64089 Smithville 53 D 20

Highest Published Home Safety Scores

ZIP Code City Score Grade Violations
63010 Arnold 83 B 2
63011 Ballwin 83 B 1
63017 Chesterfield 83 B 0
63031 Florissant 83 B 0
63033 Florissant 83 B 0

All 1161 ZIP Codes in Missouri

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

Largest water systems in Missouri

The 12 largest community water systems in Missouri, out of 580 in our data.

Show all 12 water systems

Systems with the most violations in Missouri

12 systems in Missouri with the most recorded EPA violations.

Frequently Asked Questions

Is the water safe to drink in Missouri?

Missouri has 580 community water systems serving 4,840,321 people across 1161 ZIP codes. There are 1,965 recorded violations among these water systems, including 168 health-based. 742 of 1161 ZIP codes are mapped to at least one water system with a recorded violation.

What plumbing code does Missouri follow?

Missouri's listed plumbing code type is IPC as of our last review; local jurisdictions may adopt or amend codes. Plumbing work may require a licensed plumber; check state exemptions and local requirements.

Is lead a concern in Missouri's drinking water?

2 ZIP codes in Missouri are mapped to water systems whose reported 90th-percentile lead result exceeded the EPA action level of 0.015 mg/L.

What is the radon risk in Missouri?

17% of ZIP codes in Missouri are mapped to counties classified as EPA Radon Zone 1 (highest county-level radon potential).

How to cite this page

APA ZipCheckup. (2026). Missouri Home Safety Profiles by ZIP. https://zipcheckup.com/states/missouri/
BibTeX 
@misc{zipcheckup-states-missouri,
  author = {{ZipCheckup}},
  title  = {{Missouri Home Safety Profiles by ZIP}},
  year   = {2026},
  url    = {https://zipcheckup.com/states/missouri/}
}

Page version: October 2026.

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