STATE REPORT ID 84 HEALTH VIOLATIONS

Idaho Home Safety Profiles by ZIP

324 ZIP codes · 129 water systems · UPC plumbing code · Updated

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 324 ZIP codes across Idaho, covering 129 public water systems that serve about 1,230,932 people. 86 ZIP codes carry at least one EPA violation on record.

324
ZIP Codes
129
Water Systems
86
ZIPs with Violations
UPC
Plumbing Code
B · 72
Avg Safety Score
45%
High Radon Risk (Zone 1)
#23
of 50 States
54%
ZIPs Rated A or B
80%
ZIPs with Violations
B
Idaho average: 72/100 - ranked #23 of 50 states. 1 points below the national average (73). 80% of ZIP codes have recorded violations.

Water compliance data from Idaho utilities shows a strong aggregate record - most systems across the state have maintained consistent adherence to EPA standards, the state's overall grade reflects a pattern of low violations spread across a broad geographic footprint, and health-based exceedances appear in only a small fraction of monitored utility districts.

Score Distribution

How Idaho's 324 ZIP codes are distributed across safety grades.

1
A
26
B
20
C
3
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 Safest ZIP Codes in Idaho

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 83501 LewistonNez Perce 92 A
2 83402 Idaho FallsBonneville 83 B
3 83605 CaldwellCanyon 83 B
4 83616 EagleAda 83 B
5 83634 KunaAda 83 B
6 83644 MiddletonCanyon 83 B
7 83669 StarAda 83 B
8 83703 BoiseAda 83 B
9 83705 BoiseAda 83 B
10 83712 BoiseAda 83 B

10 Lowest-Scoring ZIP Codes in Idaho

#ZIP CodeCityCountyScoreGradeViolations
1 83858 RathdrumKootenai 50 D 32
2 83638 MccallValley 50 D 73
3 83814 Coeur D AleneKootenai 52 D 23
4 83843 MoscowLatah 57 C 25
5 83353 Sun ValleyBlaine 58 C 28
6 83340 KetchumBlaine 58 C 28
7 83333 HaileyBlaine 58 C 26
8 83844 MoscowLatah 59 C 24
9 83854 Post FallsKootenai 61 C 12
10 83714 Garden CityAda 62 C 127

County Rankings

Water quality breakdown by county. 44 counties with data in Idaho.

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
16001 77 B 39 83616 (83) 83714 (62)
16003 N/A N/A 4 N/A N/A
16005 78 B 12 83201 (82) 83202 (67)
16007 N/A N/A 9 N/A N/A
16009 N/A N/A 6 N/A N/A
16011 N/A N/A 10 N/A N/A
16013 58 C 7 83333 (58) 83353 (58)
16015 N/A N/A 6 N/A N/A
16017 65 C 16 83840 (66) 83864 (63)
16019 77 B 13 83402 (83) 83401 (71)
16021 N/A N/A 5 N/A N/A
16023 N/A N/A 3 N/A N/A
16025 N/A N/A 3 N/A N/A
16027 79 B 15 83605 (83) 83686 (68)
16029 N/A N/A 4 N/A N/A
16031 N/A N/A 6 N/A N/A
16033 N/A N/A 2 N/A N/A
16035 N/A N/A 5 N/A N/A
16037 N/A N/A 5 N/A N/A
16039 N/A N/A 6 N/A N/A
16041 79 B 6 83263 (79) 83263 (79)
16043 N/A N/A 8 N/A N/A
16045 N/A N/A 4 N/A N/A
16047 N/A N/A 4 N/A N/A
16049 N/A N/A 14 N/A N/A
16051 N/A N/A 7 N/A N/A
16053 N/A N/A 3 N/A N/A
16055 59 C 13 83815 (67) 83858 (50)
16057 58 C 12 83844 (59) 83843 (57)
16059 N/A N/A 10 N/A N/A
16061 N/A N/A 3 N/A N/A
16063 N/A N/A 3 N/A N/A
16065 N/A N/A 4 N/A N/A
16067 N/A N/A 4 N/A N/A
16069 92 A 6 83501 (92) 83501 (92)
16071 N/A N/A 2 N/A N/A
16073 N/A N/A 5 N/A N/A
16075 N/A N/A 3 N/A N/A
16077 N/A N/A 3 N/A N/A
16079 67 C 13 83837 (67) 83868 (67)
16081 N/A N/A 4 N/A N/A
16083 76 B 9 83301 (76) 83316 (75)
16085 50 D 5 83638 (50) 83638 (50)
16087 N/A N/A 3 N/A N/A

Most Common Contaminants in Idaho

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Consumer Confidence Report Rule Reporting 42 100 Yes
Stage 1 DBP Rule Treatment Technique 37 73 Yes
Revised Total Coliform Rule Microbiological 35 71 No
Stage 2 DBP Rule Treatment Technique 31 54 Yes
Lead Inorganic 26 59 Yes
Contaminant 2036 Other 26 53 No
Contaminant 2046 Other 26 53 No
Contaminant 2005 Other 23 49 No

Overview

We track multi-source home safety signals for 324 ZIP records across Idaho. Home Safety Score model 4.0.0 is published for 50 scored records; missing required evidence suppresses the score.

The EPA snapshots used for this build directly map water systems to 107 ZIP records, covering 129 community water systems that serve approximately 1,230,932 people.

86 of 107 ZIP codes with a reported violation count in the available EPA record (80%) have recorded EPA violations. 84 health-based violations appear in the available health breakdown.

Plumbing Regulations

Idaho follows the Uniform Plumbing Code (2018 edition).

  • Plumbing code: UPC (2018)
  • Homeowner DIY: Allowed with permit
  • Water heater permit: Required
  • Annual backflow test: Required

Full Idaho regulations →

Areas with Most Violations

ZIP Code City Home Safety Grade Violations Health-Based System
83623 Glenns Ferry — 149 2 City of Mountain Home,
83647 Mountain Home — 149 2 City of Mountain Home,
83440 Rexburg — 138 0 City of Rexburg
83714 Garden City C 127 3 Veolia Water Idaho
83704 Boise C 125 3 Veolia Water Idaho
83706 Boise B 125 3 Veolia Water Idaho
83648 Mountain Home A F B C 111 1 Mountain Home Air Force Base
83221 Blackfoot — 93 2 City of Blackfoot
83236 Firth — 91 2 City of Shelley
83638 Mccall D 73 12 City of Mccall

Areas with No Violations

ZIP Code City Home Safety Grade System Population
83314 Bliss — City of Wendell 3,000
83332 Hagerman — City of Wendell 3,000
83347 Paul — City of Heyburn 3,000
83355 Wendell — City of Wendell 3,000
83455 Victor — City of Victor 2,361
83544 Orofino — City of Orofino 2,459
83617 Emmett — City of Emmett 6,700
83641 Melba — Veolia Water Idaho 264,978
83644 Middleton B City of Middleton 13,190
83646 Meridian C Meridian Water Department 147,340

Home Safety Score

Average Home Safety Score for Idaho: B (72/100) across 50 scored of 324 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 lead level (90th percentile): 0.0036 mg/L (EPA action level: 0.015 mg/L)
  • 0 of 107 ZIP codes with known status exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 145 ZIP codes (45%)
  • Moderate risk (Zone 2): 160 ZIP codes
  • Low risk (Zone 3): 19 ZIP codes

ZIP Code Reports for Idaho

Largest Communities

ZIP Code City Population Safety Grade Violations
83642 Meridian 444,356 C 1
83713 Boise 425,703 B 6
83709 Boise 413,476 B 12
83646 Meridian 412,318 C 0
83634 Kuna 397,216 B 2
83687 Nampa 353,930 B 9
83714 Garden City 305,305 C 127
83616 Eagle 301,483 B 3
83704 Boise 287,033 C 125
83706 Boise 286,524 B 125
83702 Boise 278,603 B 2
83703 Boise 277,758 B 2
83712 Boise 265,028 B 0
83716 Boise 265,028 — 0
83641 Melba 264,978 — 0
83705 Boise 264,978 B 0
83725 Boise 264,978 B 0
83607 Caldwell 188,966 B 21
83686 Nampa 176,487 C 30
83651 Nampa 175,090 B 9

Lowest Published Home Safety Scores

ZIP Code City Score Grade Violations
83638 Mccall 50 D 73
83858 Rathdrum 50 D 32
83814 Coeur D Alene 52 D 23
83843 Moscow 57 C 25
83333 Hailey 58 C 26

Highest Published Home Safety Scores

ZIP Code City Score Grade Violations
83501 Lewiston 92 A 54
83402 Idaho Falls 83 B 1
83605 Caldwell 83 B 1
83616 Eagle 83 B 3
83634 Kuna 83 B 2

All 324 ZIP Codes in Idaho

Data Sources

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

Largest water systems in Idaho

The 12 biggest community water systems serving Idaho, of 129 total.

Show all 12 water systems

Systems with the most violations in Idaho

12 systems in Idaho with the most recorded EPA violations.

Frequently Asked Questions

Is the water safe to drink in Idaho?

Idaho has 129 community water systems serving 1,230,932 people across 324 ZIP codes. There are 1,332 recorded violations, including 84 health-based. 86 of 324 ZIP codes have at least one violation.

What plumbing code does Idaho follow?

Idaho follows the UPC plumbing code. DIY plumbing work is allowed for homeowners.

What is the radon risk in Idaho?

45% of ZIP codes in Idaho fall in EPA Radon Zone 1 (highest risk).

How to cite this page

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

Page version: August 2026.

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