Where does the water in 16035 come from?

Water for zip code 16035 in Forestville, Pennsylvania is provided by 3 water systems. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 16035

Forestville, Pennsylvania · Butler County

140 PPM

8.2 GPG

Moderately Hard

0Soft60120180300+

High Confidence - USGS Monitoring

Dataset updated March 9, 2026Matched to 3 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 3 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

2 USGS-backed sources

3 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 16035

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.

3 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
Pa American Water Co Butler PA5100012	surface water	139 PPM Moderately Hard	43,286	High Confidence - USGS Monitoring
Cranberry Twp Wtp PA5100094	surface water	190 PPM Hard	42,000	High Confidence - USGS Monitoring
Slippery Rock Muni Auth PA5100079	groundwater	8 PPM Soft	15,778	Estimated - Nearby Data

Pa American Water Co Butler

PA5100012

Moderately Hard

139 PPMsurface water43,286 servedHigh Confidence - USGS Monitoring

Cranberry Twp Wtp

PA5100094

Hard

190 PPMsurface water42,000 servedHigh Confidence - USGS Monitoring

Slippery Rock Muni Auth

PA5100079

Soft

8 PPMgroundwater15,778 servedEstimated - Nearby Data

Nearby Zip Codes

16038139 1612766 16057140 16020140 16040140 1637256 16061140 16156139 16030140 1613381 16051140 16001140

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 Forestville, PA (16035).

Submit Your Data

Frequently Asked Questions

Is the water hard in Forestville, PA (16035)?

The average water hardness in 16035 is 140 PPM (8.2 GPG), which is classified as moderately hard.

Do I need a water softener in 16035?

With hardness of 140 PPM, a water softener is worth considering for homes in 16035.

Is hard water in 16035 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 16035?

Zip code 16035 in Forestville, Pennsylvania is served by 3 water systems.