STATE REPORT MO 2 ALERTS 404 HEALTH VIOLATIONS

Missouri Water: 3.1K Violations — 1161 ZIPs

1161 ZIP codes · 1084 water systems · IPC plumbing code · Updated 2026-06-03

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

1161
ZIP Codes
1084
Water Systems
630
ZIPs with Violations
2
Active Alerts
IPC
Plumbing Code
C · 69
Avg Safety Score
17%
High Radon Risk (Zone 1)
#21
of 51 States
50%
ZIPs Rated A or B
54%
ZIPs with Violations
C
Missouri average: 69/100 — ranked #21 of 51 states. 2 points above the national average (67). 50% of ZIP codes scored A or B.

Compared to better-performing states, Missouri public water systems record elevated violation rates — health-based exceedances appear in multiple regions, compliance gaps have persisted across recent monitoring cycles, and the state's aggregate safety grade sits well below the national median.

Score Distribution

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

44
A
542
B
305
C
270
D
0
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 Missouri

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 63853 HollandPemiscot 98 A
2 63879 WardellPemiscot 98 A
3 63758 KelsoScott 96 A
4 63860 KewaneeNew Madrid 96 A
5 63821 ArbyrdDunklin 95 A
6 63841 DexterStoddard 95 A
7 63866 MarstonNew Madrid 95 A
8 63936 DudleyStoddard 95 A
9 63874 RiscoNew Madrid 94 A
10 63882 WyattMississippi 94 A

10 Lowest-Scoring ZIP Codes in Missouri

#ZIP CodeCityCountyScoreGradeViolations
1 65440 BossIron 40 D 0
2 65439 BixbyIron 40 D 0
3 64864 SaginawCass 40 D 0
4 64508 Saint JosephBuchanan 40 D 0
5 64505 Saint JosephAndrew 40 D 0
6 64504 Saint JosephBuchanan 40 D 0
7 64493 TurneyClinton 40 D 0
8 64480 ReaAndrew 40 D 0
9 64476 PickeringNodaway 40 D 0
10 64448 FaucettPlatte 40 D 0

County Rankings

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

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
St. Louis 66 C 8 63055 (82) 63005 (51)
Jefferson 55 C 94 63070 (74) 63130 (40)
Iron 50 D 17 63621 (69) 65440 (40)
Franklin 70 B 18 63037 (83) 63077 (50)
St. Charles 60 C 13 63338 (83) 63386 (40)
Ste. Genevieve 59 C 3 63627 (79) 63670 (45)
Washington 72 B 8 63622 (82) 63071 (53)
Franklin,St. Louis 60 C 1 63073 (60) 63073 (60)
St. Francois 60 C 9 63624 (83) 63651 (53)
Audrain 59 C 14 63352 (81) 63301 (40)
Lincoln 59 C 12 63349 (83) 63369 (45)
Montgomery 78 B 9 63350 (83) 63370 (63)
Pike 63 C 7 63441 (83) 63433 (53)
Miller 68 C 9 65032 (83) 65083 (53)
Warren 72 B 4 63380 (83) 63378 (63)
Gasconade 69 C 6 63363 (83) 65061 (53)
Callaway 76 B 12 65063 (83) 65080 (63)
Marion 64 C 6 63463 (83) 63471 (50)
Clark 62 C 9 63445 (83) 63430 (50)
Shelby 65 C 9 63437 (83) 63464 (53)
Lewis 70 B 10 63452 (83) 63458 (53)
Ralls 60 C 3 63459 (73) 65282 (53)
Scotland 58 C 3 63555 (69) 63563 (53)
Knox 64 C 5 63446 (79) 63547 (53)
Monroe 69 C 5 65263 (83) 65258 (53)
Perry 65 C 10 63746 (83) 63673 (50)
Adair 73 B 4 63533 (82) 63540 (53)
Macon 67 C 9 63532 (83) 65247 (53)
Schuyler 65 C 8 63536 (83) 63567 (53)
Sullivan 70 B 8 64646 (83) 64655 (53)
Linn 74 B 10 64630 (83) 63566 (53)
Putnam 66 C 3 63565 (81) 63666 (53)
Reynolds 74 B 6 63629 (83) 63665 (63)
Madison 66 C 4 63655 (76) 63632 (53)
Cape Girardeau 69 C 14 63766 (82) 63779 (53)
Stoddard 85 A 12 63841 (95) 63738 (66)
Scott 83 B 11 63758 (96) 63742 (60)
Bollinger 67 C 5 63760 (83) 63747 (53)
Wayne 69 C 10 63944 (83) 63951 (53)
Mississippi 84 B 5 63882 (94) 63881 (66)
Dunklin 86 A 10 63821 (95) 63875 (66)
Pemiscot 79 B 11 63853 (98) 63840 (66)
New Madrid 83 B 14 63860 (96) 63878 (66)
Clay 65 C 26 64048 (70) 64073 (45)
Butler 83 B 9 63940 (93) 63938 (66)
Ripley 63 C 6 63953 (83) 63955 (53)
Carter 75 B 4 63937 (81) 63943 (72)
Oregon 72 B 6 65692 (83) 65690 (53)
Lafayette 75 B 11 64001 (83) 64022 (53)
Jackson 65 C 77 64014 (70) 64070 (40)
Cass 61 C 14 64747 (68) 64864 (40)
Ray 70 B 8 64085 (82) 64680 (53)
Platte 62 C 17 64092 (70) 64448 (40)
Johnson 78 B 8 64019 (83) 65305 (53)
Buchanan 47 D 8 64443 (64) 64508 (40)
Gentry 67 C 4 64402 (82) 64438 (53)
Worth 70 B 5 64499 (82) 64441 (53)
Andrew 54 D 11 64449 (69) 64505 (40)
DeKalb 72 B 9 64474 (88) 64497 (50)
Nodaway 59 C 14 64487 (68) 64476 (40)
Harrison 72 B 8 64481 (83) 64467 (53)
Holt 62 C 7 64429 (70) 64437 (48)
Atchison 63 C 5 64498 (70) 64491 (57)
Clinton 63 C 5 64454 (70) 64493 (40)
Carroll 76 B 8 64682 (83) 64681 (63)
Livingston 76 B 6 64638 (83) 64686 (53)
Daviess 74 B 7 64636 (83) 64689 (53)
Caldwell 73 B 9 64637 (83) 64654 (53)
Mercer 72 B 4 64632 (82) 64672 (53)
Chariton 69 C 8 65281 (83) 65246 (53)
Grundy 83 B 4 64641 (83) 64679 (82)
Bates 72 B 10 64745 (82) 64765 (53)
St. Clair 73 B 6 64738 (83) 64781 (53)
Henry 78 B 6 64788 (83) 64770 (71)
Vernon 70 B 11 64741 (83) 64778 (53)
Cedar 72 B 3 64744 (82) 65607 (53)
Barton 78 B 4 64748 (83) 64762 (72)
Jasper 75 B 17 64755 (83) 64859 (53)
Dade 70 B 8 65635 (83) 65752 (53)
Newton 76 B 9 64840 (83) 64858 (63)
McDonald 71 B 10 64867 (83) 64868 (53)
Lawrence 76 B 11 65705 (83) 64873 (63)
Barry 81 B 10 65647 (83) 65708 (68)
Osage 70 B 13 65054 (83) 65075 (53)
Boone 77 B 16 65010 (83) 65256 (53)
Morgan 78 B 7 65011 (83) 65329 (53)
Moniteau 75 B 9 65025 (83) 65055 (53)
Camden 73 B 12 65324 (83) 65764 (53)
Cole 78 B 14 65074 (83) 65053 (63)
Maries 74 B 3 65058 (83) 65582 (57)
Cooper 79 B 7 65068 (83) 65279 (63)
Howard 74 B 5 65248 (83) 65230 (53)
Randolph 68 C 8 65243 (83) 65278 (53)
Pettis 80 B 7 65350 (83) 65333 (76)
Saline 77 B 10 65344 (83) 65321 (53)
Benton 75 B 5 65325 (83) 65345 (53)
Phelps 65 C 11 65402 (82) 65529 (50)
Texas 65 C 18 65542 (83) 65660 (53)
Shannon 75 B 4 65438 (83) 65546 (53)
Crawford 71 B 6 65441 (83) 65586 (53)
Pulaski 72 B 10 65473 (83) 65457 (55)
Laclede 65 C 6 65662 (83) 65722 (53)
Dent 70 B 2 65560 (77) 65501 (63)
Howell 72 B 7 65688 (83) 65790 (53)
Greene 74 B 28 65612 (83) 65645 (53)
Douglas 67 C 2 65608 (80) 65755 (53)
Ozark 59 C 18 65609 (83) 65784 (53)
Christian 69 C 11 65610 (83) 65720 (53)
Taney 73 B 18 65726 (83) 65744 (53)
Polk 76 B 7 65649 (83) 65640 (53)
Dallas 70 B 6 65685 (83) 65727 (53)
Stone 79 B 11 65631 (83) 65656 (71)
Webster 77 B 5 65632 (83) 65706 (70)
Hickory 76 B 7 65668 (83) 65735 (63)
Wright 68 C 7 65667 (83) 65768 (53)

Most Common Contaminants in Missouri

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Consumer Confidence Report Rule Reporting 311 729 Yes
Surface Water Treatment Rule Treatment Technique 258 512 No
Stage 1 DBP Rule Treatment Technique 247 278 No
Stage 2 DBP Rule Treatment Technique 186 272 No
Lead and Copper Rule Treatment Technique 171 316 No
Total Trihalomethanes (TTHM) Disinfection Byproducts 125 211 Yes
Contaminant 0700 Other 121 298 Yes
Total Coliform Microbiological 52 78 No

Overview

We track water quality, weather alerts, plumbing regulations, and energy rebates for 1161 ZIP codes across Missouri, covering 1084 community water systems that serve approximately 4,355,541 people.

630 of 1161 ZIP codes (54%) have recorded EPA violations. 404 health-based violations have been documented.

Active Weather Alerts

2 active alerts in Missouri including 2 warnings. 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 Vernon, MO
Flood Warning Severe St. Clair, MO; Vernon, MO

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 Safety Score Violations Health-Based System
63736 Benton A 64 1 Scott County Pwsd 4
63740 Chaffee B 64 1 Chaffee Public Water System
63341 Defiance D 38 22 St Charles County Pwsd 2
65712 Mount Vernon B 38 5 Mount Vernon Public Water System
65801 Springfield B 26 2 Springfield Public Water System
65802 Springfield B 26 2 Springfield Public Water System
65803 Springfield B 26 2 Springfield Public Water System
65804 Springfield B 26 2 Springfield Public Water System
65805 Springfield B 26 2 Springfield Public Water System
65806 Springfield B 26 2 Springfield Public Water System

Areas with No Violations

ZIP Code City Safety Score System Population
63011 Ballwin D MO AMERICAN ST LOUIS ST CHARLES COUNTIES 1,111,000
63012 Barnhart B Jefferson Company Cons Pwsd C 1 37,000
63015 Catawissa C Franklin County Pwsd 3 8,250
63021 Ballwin D MO AMERICAN ST LOUIS ST CHARLES COUNTIES 1,111,000
63022 Ballwin D MO AMERICAN ST LOUIS ST CHARLES COUNTIES 1,111,000
63024 Ballwin D MO AMERICAN ST LOUIS ST CHARLES COUNTIES 1,111,000
63030 Fletcher C JEFFERSON COUNTY PWSD 5 8,000
63031 Florissant D Mo American St Louis St Charles Counties 1,111,000
63032 Florissant C FRONTIER ESTATES 120
63033 Florissant D Mo American St Louis St Charles Counties 1,111,000

Home Safety Score

Average Home Safety Score for Missouri: C (69/100)

Lead & Copper

  • Average lead level (90th percentile): 0.0025 mg/L (EPA action level: 0.015 mg/L)
  • 0 ZIP codes 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
63366 O Fallon 1,292,378 C 6
63376 Saint Peters 1,257,102 D 0
63368 O Fallon 1,250,544 B 6
63052 Imperial 1,226,861 B 3
63304 Saint Charles 1,224,587 D 0
63010 Arnold 1,196,712 C 1
63049 High Ridge 1,189,540 B 1
63012 Barnhart 1,186,630 B 0
63026 Fenton 1,181,721 C 3
63025 Eureka 1,136,218 C 3
63069 Pacific 1,135,797 C 3
63125 Saint Louis 1,132,113 D 0
63128 Saint Louis 1,132,113 D 0
63129 Saint Louis 1,132,113 D 0
63040 Grover 1,128,888 C 0
63301 Saint Charles 1,124,000 D 0
63303 Saint Charles 1,124,000 D 0
63005 Chesterfield 1,122,629 D 8
63006 Chesterfield 1,113,079 C 8
63017 Chesterfield 1,113,079 C 8

Lowest Safety Scores

ZIP Code City Score Grade Violations
63011 Ballwin 40 D 0
63021 Ballwin 40 D 0
63022 Ballwin 40 D 0
63024 Ballwin 40 D 0
63045 Earth City 40 D 0

Highest Safety Scores

ZIP Code City Score Grade Violations
63853 Holland 98 A 3
63879 Wardell 98 A 2
63758 Kelso 96 A 0
63860 Kewanee 96 A 3
63821 Arbyrd 95 A 1

All 1161 ZIP Codes in Missouri

Data Sources

Updated daily.

Frequently Asked Questions

Is the water safe to drink in Missouri?

Missouri has 1084 community water systems serving 4,355,541 people across 1161 ZIP codes. There are 3,116 recorded violations, including 404 health-based. 630 of 1161 ZIP codes have at least one violation.

What plumbing code does Missouri follow?

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

What is the radon risk in Missouri?

17% of ZIP codes in Missouri fall in EPA Radon Zone 1 (highest risk).

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