Where does the water in 05735 come from?

Water for zip code 05735 in Castleton, Vermont is provided by 4 water systems. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 05735

Q: Is the water hard in Castleton, VT (05735)?

The average water hardness in 05735 is 23 PPM (1.4 GPG), which is classified as soft. No water treatment is typically needed.

Q: Do I need a water softener in 05735?

At 23 PPM, your water is relatively soft. A water softener is generally not necessary, though some homeowners prefer the feel of softened water.

Castleton, Vermont · Rutland County

23 PPM

1.4 GPG

Soft

0Soft60120180300+

Estimated — Nearby Data

Dataset updated March 9, 2026Matched to 4 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 4 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 estimated sources

This ZIP reading needs local confirmation before equipment sizing or purchase decisions.

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 05735

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.

4 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
Rutland City Water Dept VT0005229	surface water	17 PPM Soft	18,500	Estimated — Nearby Data
Castleton Fire District 1 VT0005212	groundwater	67 PPM Slightly Hard	1,940	Estimated — Nearby Data
Castleton Fire District 3 VT0020889	groundwater	67 PPM Slightly Hard	500	Estimated — Nearby Data
Windy Hollow VT0005594	groundwater	67 PPM Slightly Hard	118	Estimated — Nearby Data

Rutland City Water Dept

VT0005229

Soft

17 PPMsurface water18,500 servedEstimated — Nearby Data

Castleton Fire District 1

VT0005212

Slightly Hard

67 PPMgroundwater1,940 servedEstimated — Nearby Data

Castleton Fire District 3

VT0020889

Slightly Hard

67 PPMgroundwater500 servedEstimated — Nearby Data

Windy Hollow

VT0005594

Slightly Hard

67 PPMgroundwater118 servedEstimated — Nearby Data

Nearby Zip Codes

0573217 0574417 0576522 0574317 0573617 0576423 0577717 0576322 0573348 0575717 05760191 12837276

What This Means For You

Recommendations are based on the displayed ZIP hardness reading. Confirm your tap reading before sizing or buying treatment equipment.

Your Water Is Soft

Your water hardness is in the soft range. You likely don't need a water softener. Enjoy your naturally soft 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 Castleton, VT (05735).

Submit Your Data

Frequently Asked Questions

Is the water hard in Castleton, VT (05735)?

Our estimate for 05735 is 23 PPM (1.4 GPG), but it is based on nearby, county, or state-level data rather than a direct treated tap-water report for this exact location. Confirm with your utility or a home test.

Do I need a water softener in 05735?

Do not size a softener from this estimate alone. Confirm the actual tap-water hardness before choosing treatment equipment.

Is hard water in 05735 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 05735?

Zip code 05735 in Castleton, Vermont is served by 4 water systems.

Learn More About Your Water

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

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