Water Hardness in 57754
Spearfish Canyon, South Dakota · Lawrence County
Dataset updated March 9, 2026Matched to 7 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 7 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.
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 57754
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.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
| Spearfish SD4600311 | groundwater | 218 PPM Hard | |
| Lead SD4602164 | surface water | 459 PPM Very Hard | |
| Terry Trojan Water District SD4600053 | groundwater | 597 PPM Very Hard | |
| Paradise Water Company Llc SD4602323 | surface water | 250 PPM Very HardUSGS estimate: 459 PPM | |
| Deer Mountain Sanitary District SD4600549 | surface water | 459 PPM Very Hard |
Nearby Zip Codes
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.
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 Spearfish Canyon, SD (57754).
Frequently Asked Questions
Is the water hard in Spearfish Canyon, SD (57754)?
The average water hardness in 57754 is 276 PPM (16.1 GPG), which is classified as very hard.
Do I need a water softener in 57754?
With hardness of 276 PPM, a water softener is recommended for homes in 57754.
Is hard water in 57754 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 57754?
Zip code 57754 in Spearfish Canyon, South Dakota is served by 7 water systems.
Learn More About Your Water
How to Test Water Hardness at Home
Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.
8 min readWater Hardness Scale: PPM and GPG Chart
Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.
10 min readWell Water Hardness: Why It's Usually Hard & How to Treat It
Well water is almost always harder than city water. Learn why, how to test your well, and the best treatment options for hard well water.
8 min read