WH

Water Hardness in 81647

New Castle, Colorado · Garfield County

330 PPM
19.3 GPG
Very Hard
0Soft60120180300+
High Confidence - USGS Monitoring

Dataset updated March 9, 2026Matched to 7 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 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.

Source basis
4 USGS-backed sources
7 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 81647

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.

7 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.
New Castle Town Of
CO0123538
Hard
195 PPMsurface water5,024 servedHigh Confidence - USGS Monitoring
Battlement Mesa Md
CO0123133
Very Hard
410 PPMsurface water4,100 servedEstimated - County Avg
Roaring Fork Wsd
CO0123125
Very Hard
410 PPMgroundwater1,912 servedEstimated - County Avg
Apple Tree Park
CO0123734
Very Hard
410 PPMgroundwater1,160 servedHigh Confidence - USGS Monitoring
Mitchell Cooper Ditch Pipeline
CO0123510
Very Hard
410 PPMsurface water1,028 servedEstimated - County Avg
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

81601415816523378163718981623289

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.

MethodologyData sourcesHow 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 New Castle, CO (81647).

Submit Your Data

Frequently Asked Questions

Is the water hard in New Castle, CO (81647)?

The average water hardness in 81647 is 330 PPM (19.3 GPG), which is classified as very hard.

Do I need a water softener in 81647?

With hardness of 330 PPM, a water softener is recommended for homes in 81647.

Is hard water in 81647 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 81647?

Zip code 81647 in New Castle, Colorado 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 read

Water 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 read

Well 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