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City water profile

Grenville water quality

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

Median indexed hardness

821PPM

One indexed ZIP

Range 821–821 PPM

State comparison
305 PPM above
State hardness rank
#54 of 222
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Grenville has 1 published ZIP profile across Day County. The indexed median is 821 PPM, compared with 516 PPM across South Dakota.

Among the 222 South Dakotacities with an indexed median, Grenville ranks #54from 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 hard0 ZIPs
Hard0 ZIPs
Very hard1 ZIP

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
36.6 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Mar 29, 2016 to Jan 15, 2026.

ZIP directory

Water reports in Grenville

Open a ZIP for site-level provenance and measurements.

ZIP code

57239

Very Hard

821 PPM

Nearest site
36.6 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Grenville

PWSID SD4600146

Surface water
System population served
48
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 RuleSD4600146Aug 1, 2025Resolved

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 Grenville

Is the water hard?

The indexed city median is 821 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.