Where does the water in 57315 come from?

Water for zip code 57315 in Avon, South Dakota is provided by 2 water systems. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 57315

Avon, South Dakota · Bon Homme County

236 PPM

13.8 GPG

Hard

0Soft60120180300+

High Confidence - USGS Monitoring

Dataset updated March 9, 2026Matched to 2 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 2 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis

1 USGS-backed source

2 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.

Water source profile

Primarily surface water

Surface-water hardness can shift with reservoirs, runoff, season, and treatment. This profile is weighted by known population served across matched systems.

Data recency

March 9, 2026

Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.

Water Systems Serving 57315

These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.

2 water systems

PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.

Water System	Source	Hardness	Pop. Served	Data Source
By Water District SD4600865	surface water	221 PPM Hard	13,320	Estimated - Nearby Data
Avon SD4600031	surface water	569 PPM Very Hard	590	High Confidence - USGS Monitoring

By Water District

SD4600865

Hard

221 PPMsurface water13,320 servedEstimated - Nearby Data

Avon

SD4600031

Very Hard

569 PPMsurface water590 servedHigh Confidence - USGS Monitoring

Nearby Zip Codes

573291873 57066246 57062269 573801339 57376267 57059252 57063221 57330242 573611873 68760447 6874668 57040808

What This Means For You

Use this ZIP reading as a local planning estimate, not a final treatment specification. Hardness can vary by utility zone, seasonal blend, private well, and building plumbing. Confirm your tap reading with a utility report or home hardness test before sizing equipment.

Methodology Data sources How to test your water

Know your water hardness?

If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Avon, SD (57315).

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Frequently Asked Questions

Is the water hard in Avon, SD (57315)?

The average water hardness in 57315 is 236 PPM (13.8 GPG), which is classified as hard.

Do I need a water softener in 57315?

With hardness of 236 PPM, a water softener is recommended for homes in 57315.

Is hard water in 57315 safe to drink?

Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.

How many water systems serve 57315?

Zip code 57315 in Avon, South Dakota is served by 2 water systems.