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City water profile

Clear Lake water quality

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

Median indexed hardness

731PPM

2 indexed ZIPs

Range 408–1053 PPM

State comparison
215 PPM above
State hardness rank
#62 of 222
Matched utilities
3
Active health records
0

City summary

What the indexed records say

Clear Lake has 2 published ZIP profiles across Deuel County and Marshall County. The indexed median is 731 PPM, compared with 516 PPM across South Dakota.

Among the 222 South Dakotacities with an indexed median, Clear Lake ranks #62from highest to lowest. Across all 246 state ZIP profiles, available estimates run from 20.5to 1330 PPM.

The 408–1053 PPM range shows how much the available ZIP estimates vary within the city label. 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 hard0 ZIPs
Hard0 ZIPs
Very hard2 ZIPs

2 of 2 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
13.4 miles
Profiles with evidence
2/2

Confidence labels

High: 0Moderate: 1Low: 1

Observation window: May 23, 2016 to May 1, 2024.

ZIP directory

Water reports in Clear Lake

Open a ZIP for site-level provenance and measurements.

ZIP code

57226

Very Hard

1053 PPM

Nearest site
13.4 mi
Confidence
Low

View full ZIP evidence →

ZIP code

57247

Very Hard

408 PPM

Nearest site
12.7 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Brookings-Deuel Rural Water System

PWSID SD4600430

Groundwater
System population served
6,200
Last reported
Jun 17, 2026

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

Clear Lake

PWSID SD4600092

Groundwater
System population served
1,218
Last reported
Jun 17, 2026

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

Lake City

PWSID SD4600186

Groundwater
System population served
45
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.

No violation records are included in the current lookback window.

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 Clear Lake

Is the water hard?

The indexed city median is 731 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.