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City water profile

Frankfort water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Frankfort, South Dakota.

Median indexed hardness

69PPM

One indexed ZIP

Range 68.8–68.8 PPM

State comparison
447 PPM below
State hardness rank
#219 of 222
Matched utilities
3
Active health records
0

City summary

What the indexed records say

Frankfort has 1 published ZIP profile across Spink County. The indexed median is 69 PPM, compared with 516 PPM across South Dakota.

Among the 222 South Dakotacities with an indexed median, Frankfort ranks #219from highest to lowest. Across all 246 state ZIP profiles, available estimates run from 20.5to 1330 PPM.

Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard1 ZIP
Hard0 ZIPs
Very hard0 ZIPs

1 of 1 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
74.5 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: May 1, 2024 to May 1, 2024.

ZIP directory

Water reports in Frankfort

Open a ZIP for site-level provenance and measurements.

ZIP code

57440

Moderately Hard

68.8 PPM

Nearest site
74.5 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Spink Colony

PWSID SD4602059

Groundwater
System population served
108
Last reported
Jun 17, 2026

EPA SDWIS explicitly lists this ZIP in the system's served geography.

Glendale Colony

PWSID SD4602060

Groundwater
System population served
95
Last reported
Jun 17, 2026

EPA SDWIS explicitly lists this ZIP in the system's served geography.

Camrose Colony

PWSID SD4602345

Groundwater
System population served
80
Last reported
Jun 17, 2026

EPA SDWIS explicitly lists this ZIP in the system's served geography.

Compliance history

What EPA records show

No active health-based violation appears among the associated systems in the represented EPA reporting quarter. This does not mean every contaminant was tested at every tap.

RecordSystemPeriodStatus
Revised Total Coliform RuleSD4602060Nov 1, 2025Archived · health-based
Revised Total Coliform RuleSD4602060Oct 1, 2024Resolved
Combined UraniumSD4602059Jan 1, 2022Resolved
Gross Alpha, Excl. Radon and USD4602059Jan 1, 2022Resolved
Combined Radium (-226 and -228)SD4602059Jan 1, 2022Resolved

Practical next steps

Move from index to evidence

  1. 1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
  2. 2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
  3. 3. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Questions people ask

About water in Frankfort

Is the water hard?

The indexed city median is 69 PPM. Open the ZIP report to verify the distance and confidence behind that estimate.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.