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City water profile

Sioux Falls water quality

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

Median indexed hardness

420PPM

6 indexed ZIPs

Range 419–878 PPM

State comparison
96 PPM below
State hardness rank
#162 of 222
Matched utilities
9
Active health records
1

City summary

What the indexed records say

Sioux Falls has 6 published ZIP profiles across Minnehaha County and Lincoln County. The indexed median is 420 PPM, compared with 516 PPM across South Dakota.

Among the 222 South Dakotacities with an indexed median, Sioux Falls ranks #162from highest to lowest. Across all 246 state ZIP profiles, available estimates run from 20.5to 1330 PPM.

The 419–878 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 hard6 ZIPs

6 of 6 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
43.1 miles
Profiles with evidence
6/6

Confidence labels

High: 0Moderate: 0Low: 6

Observation window: Aug 9, 2016 to Apr 15, 2026.

ZIP directory

Water reports in Sioux Falls

Open a ZIP for site-level provenance and measurements.

ZIP code

57104

Very Hard

419 PPM

Nearest site
34 mi
Confidence
Low

View full ZIP evidence →

ZIP code

57106

Very Hard

420.5 PPM

Nearest site
43.1 mi
Confidence
Low

View full ZIP evidence →

ZIP code

57107

Very Hard

419 PPM

Nearest site
37.6 mi
Confidence
Low

View full ZIP evidence →

ZIP code

57108

Very Hard

714 PPM

Nearest site
55.9 mi
Confidence
Low

View full ZIP evidence →

ZIP code

57110

Very Hard

878 PPM

Nearest site
61.6 mi
Confidence
Low

View full ZIP evidence →

ZIP code

57117

Very Hard

419 PPM

Nearest site
39.5 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Sioux Falls

PWSID SD4600294

Surface water
System population served
216,462
Last reported
Jun 17, 2026

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

Valley View Estates

PWSID SD4600300

Groundwater
System population served
230
Last reported
Jun 17, 2026

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

Paradise Water Company Llc

PWSID SD4602323

Surface water
System population served
178
Last reported
Jun 17, 2026

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

Golden Hills Subdivision

PWSID SD4602284

Groundwater
System population served
30
Last reported
Jun 17, 2026

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

Tm Rural Water District

PWSID SD4600999

Surface water
System population served
4,250
Last reported
Jun 17, 2026

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

Skyline Heights

PWSID SD4600297

Surface water
System population served
110
Last reported
Jun 17, 2026

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

Lincoln County Rural Water System

PWSID SD4600304

Groundwater
System population served
5,965
Last reported
Jun 17, 2026

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

Two Bit Ranch Estates

PWSID SD4602319

Groundwater
System population served
30
Last reported
Jun 17, 2026

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

Pine Lake Hills

PWSID SD4600624

Groundwater
System population served
320
Last reported
Jun 17, 2026

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

Compliance history

What EPA records show

1 unique active health-based record appears among associated systems. This does not mean every contaminant was tested at every tap.

RecordSystemPeriodStatus
Stage 1 Disinfectants and Disinfection Byproducts RuleSD4600624Jul 7, 2025Resolved · health-based
ChlorineSD4600304Apr 1, 2024Resolved
Stage 1 Disinfectants and Disinfection Byproducts RuleSD4600300Aug 15, 2021Unaddressed · health-based

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 Sioux Falls

Is the water hard?

The indexed city median is 420 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.