CITY REPORT SD

Humboldt, SD: High Radon Potential Area - Home Safety 67/100

1 ZIP code · 3 water systems · Updated

ZipCheckup grade for Humboldt: C.

A mixed picture - some signals here are worth your attention.

Within Humboldt, the records summarized for SD produce a C grade - a middle reading that calls for checking the specific system at your address.

How Humboldt Compares

Humboldt67/100
South Dakota avg69/100
National avg73/100

Data: EPA SDWIS

1
ZIP Codes
3
Water Systems
0
ZIPs Linked to Systems with Violations
C · 67
Avg Safety Score
Zone 1
County Radon Potential (High)
$305K
Median Home Value

Humboldt Water: The Quick Version

  • Average of reported 90th-percentile lead results: 0.002 mg/L.
  • Homes built before 1986: 57% - older plumbing may contain lead solder.
  • Health risk index (ZipCheckup composite of CDC data): 12.17.

Water Systems Serving Humboldt

3 systems shown for Humboldt, SD, from 3 on the federal list.

Overview

We track home safety data for 1 ZIP code in Humboldt, South Dakota (population ~1,527), covering 3 community water systems serving approximately 23,286 people region-wide. The EPA snapshots used for this build directly map water systems to 1 of 1 ZIP codes.

The available EPA record reports 0 violations for 1 ZIP code with a reported violation count.

Home Safety Score

Average Home Safety Score for Humboldt: C (67/100)

Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:

Factor What It Measures
Water Quality EPA violations and compliance history
PFAS MCL Screen UCMR 5 testing against the covered federal MCLs
Radon Risk EPA radon zone classification
Annual AQI EPA AirData county-year median with at least 90 observed days

Water Sources

Humboldt water systems draw from: Groundwater.

Lead & Copper

  • Average of reported 90th-percentile lead results: 0.0020 mg/L (EPA action level: 0.015 mg/L)
  • 0 of 1 ZIP code with known status exceed the EPA lead action level

Radon Risk

1 of 1 ZIP records with known zones is in EPA Radon Zone 1.

The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.

Areas with No Violations

ZIP Code Safety Score System Population
57035 C Minnehaha Community Water Corporation 13,435

All ZIP Codes in Humboldt

Data Sources

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

CDC Health Data for Humboldt

9.7%
Asthma (US: 9.8%)
10.6%
Diabetes (US: 10.4%)
15.7%
Poor Mental Health (US: 14.8%)

Source: CDC PLACES (County-level estimates). County health indicators are shown for context only and are not linked to this area's water records.

Compared to National Average

Asthma 9.7% ↓
Diabetes 10.6% ↑
Mental Health 15.7% ↑

Vertical line = national average. ■ Above national · ■ Below national

How Old Is Humboldt's Housing Stock?

1974
Median Build Year
57%
Built Before 1986
46%
Built Before 1970
Copper
Likely Pipe Material

With 57% of homes built before 1986, lead solder in plumbing is a potential concern. Federal law banned lead solder in drinking-water plumbing in 1986, but many older homes retain original plumbing.

Source: U.S. Census Bureau American Community Survey (ACS).

Housing Age Profile

Ask the water utility whether your address in Humboldt has a lead service line; its inventory can answer what a median build year of 1974 cannot.

1974
Median Year Built
57%
Pre-1986 (lead solder era; lead paint banned 1978)
46%
Pre-1970 (Lead Pipes Risk)
Pre-1970 (46%) 1970–1986 (11%) Post-1986 (43%)

Over half of homes in Humboldt were built before 1986, when federal law began restricting lead solder in drinking-water plumbing. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.

Source: U.S. Census Bureau ACS B25034.

Protecting Children from Lead in Humboldt

57%
Homes Built Before 1986
0.002
mg/L average of reported water-system 90th-percentile lead results (the 0.015 action level applies to each system's result, not to this average)

Why children are most at risk: The CDC states that no safe blood lead level in children has been identified. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.

If you have young children or are pregnant, consider testing your home's water - especially if your home was built before 1986.

Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.

What You Can Do in Humboldt

  1. Test your water at home. City-level data shows averages - your tap may differ. Check the certification, price and turnaround time of any water test kit or lab service.
  2. Install a certified water filter. Choose a pitcher or under-sink filter certified to reduce the specific contaminants of concern.
  3. Check your home's plumbing. With 57% of homes built before 1986, lead solder is a real possibility.

Deep Dive Reports

Detailed analysis for Humboldt, SD

Frequently Asked Questions

What does the Home Safety Score mean for Humboldt, SD?
Humboldt has an average Home Safety Score of 67/100 (Grade C) under ZipCheckup model 4.0.0, an area-level model that draws on EPA water compliance records, PFAS screening, EPA radon zones, and annual EPA air quality data; see the methodology page for how inputs and coverage are handled. The available EPA record reports no violations for ZIP codes with reported counts. Check individual ZIP code reports for component details.
Does Humboldt water have lead?
The average of the reported 90th-percentile lead results across the ZIP codes of Humboldt is 0.002 mg/L. The EPA action level of 0.015 mg/L applies to each water system's own 90th percentile, not to this average. EPA's health goal for lead is zero. Lead levels can vary by home - testing is recommended especially in older properties.
How does Humboldt compare to South Dakota average?
Humboldt has an average Home Safety Score of 67/100, which is below the South Dakota state average of 69/100 for the same model series.
How many water systems serve Humboldt?
Our records map 3 water systems to 1 ZIP code in Humboldt. The related population figure in our data is approximately 1,527 people; it is not a count of people served citywide.
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How to cite this page

APA ZipCheckup. (2026). Humboldt, SD: High Radon Potential Area - Home Safety 67/100. https://zipcheckup.com/cities/sd/humboldt/
BibTeX 
@misc{zipcheckup-cities-sd-humboldt,
  author = {{ZipCheckup}},
  title  = {{Humboldt, SD: High Radon Potential Area - Home Safety 67/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/cities/sd/humboldt/}
}

Page version: October 2026.

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