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City water profile

Westwood Colony water quality

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

Median indexed hardness

408PPM

One indexed ZIP

Range 408–408 PPM

State comparison
108 PPM below
State hardness rank
#165 of 222
Matched utilities
7
Active health records
0

City summary

What the indexed records say

Westwood Colony has 1 published ZIP profile across Marshall County. The indexed median is 408 PPM, compared with 516 PPM across South Dakota.

Among the 222 South Dakotacities with an indexed median, Westwood Colony ranks #165from 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.

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
3.4 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

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

ZIP directory

Water reports in Westwood Colony

Open a ZIP for site-level provenance and measurements.

ZIP code

57430

Very Hard

408 PPM

Nearest site
3.4 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Brown-Day-Marshall Rws

PWSID SD4600882

Groundwater
System population served
5,673
Last reported
Jun 17, 2026

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

Britton

PWSID SD4600388

Groundwater
System population served
1,215
Last reported
Jun 17, 2026

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

Sunset Colony

PWSID SD4602025

Groundwater
System population served
140
Last reported
Jun 17, 2026

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

Peever

PWSID SD4600237

Groundwater
System population served
140
Last reported
Jun 17, 2026

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

Claremont

PWSID SD4600090

Groundwater
System population served
108
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.

Amherst Water Company

PWSID SD4600030

Groundwater
System population served
40
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 RuleSD4600388Jan 1, 2022Resolved
ChlorineSD4600388Jan 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 Westwood Colony

Is the water hard?

The indexed city median is 408 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.