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Water Hardness in 03818

Conway, New Hampshire · Carroll County

20 PPM
1.2 GPG
Soft
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
6 USGS-backed sources
7 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.
Water source profile
Primarily groundwater
Groundwater commonly picks up calcium and magnesium after contact with rock and soil. 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 03818

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.
North Conway Water Pct
NH0511030
Soft
16 PPMgroundwater5,500 servedEstimated — Nearby Data
Conway Water And Sewer
NH0511010
Soft
16 PPMgroundwater2,745 servedHigh Confidence — USGS Monitoring
Birch Hill East
NH0512010
Slightly Hard
80 PPMgroundwater550 servedHigh Confidence — USGS Monitoring
Rockhouse Mountain
NH0512240
Soft
16 PPMgroundwater480 servedHigh Confidence — USGS Monitoring
Hale Estates
NH0512270
Soft
16 PPMgroundwater220 servedHigh Confidence — USGS Monitoring
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

038972503817160387525038861603812160384916038601603883160383816032151003832250384516

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 Conway, NH (03818).

Submit Your Data

Frequently Asked Questions

Is the water hard in Conway, NH (03818)?

The average water hardness in 03818 is 20 PPM (1.2 GPG), which is classified as soft.

Do I need a water softener in 03818?

At 20 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 03818 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 03818?

Zip code 03818 in Conway, New Hampshire is served by 7 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.

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How to Test Water Hardness at Home

Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.

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