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Water Hardness in 03820

Madbury, New Hampshire · Strafford County

93 PPM
5.4 GPG
Slightly 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
1 USGS-backed source
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 03820

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.
Dover Water Dept
NH0651010
Moderately Hard
163 PPMgroundwater29,000 servedEstimated - Nearby Data
Rochester Water Dept
NH2001010
Soft
23 PPMsurface water25,000 servedEstimated - Nearby Data
Unh/Durham Water Sys
NH0691010
Moderately Hard
126 PPMsurface water16,000 servedHigh Confidence - USGS Monitoring
Somersworth Water Works
NH2151010
Soft
23 PPMsurface water12,000 servedEstimated - Nearby Data
Barrington Mobile Home Estates
NH0153050
Moderately Hard
163 PPMgroundwater198 servedEstimated - Nearby Data
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

03869940387893038249303903480390852038399303901520382593038571090380111003904480386792

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 Madbury, NH (03820).

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Frequently Asked Questions

Is the water hard in Madbury, NH (03820)?

The average water hardness in 03820 is 93 PPM (5.4 GPG), which is classified as slightly hard.

Do I need a water softener in 03820?

At 93 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 03820 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 03820?

Zip code 03820 in Madbury, New Hampshire is served by 7 water systems.

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