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City water profile

Water hardness in Marlborough

Find official utility reports, understand hardness, and check the water system serving your home in Marlborough, New Hampshire.

Utility-reported hardness

Not yet available

Check your provider and source →
State comparison
Unavailable
Evidence comparison rank
—
Matched utilities
2
Active health records
0

Your tap water

What does the utility report?

Match the utility name to your water bill. These results describe the utility’s water, not a test at your home. A ZIP can include several water systems.

Utility hardness unavailable in this index

Nearby river or groundwater samples cannot tell us the hardness coming out of your tap. Ask your water provider for total hardness as CaCO₃, or test it at home.

Find an official utility report →
Convert a hardness result →Test your tap →

Match the name on your water bill

Your utility’s measurements and compliance records

These are possible serving systems. A record for one system does not apply to every home in this ZIP. Confirm your provider before interpreting a measurement or notice. Federal records can lag current utility notices.

EPA snapshot: 2026Q2. Historical window begins Jan 1, 2021.

Marlborough Water Works

NH1481010 · Groundwater · 750 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →
Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Copper (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Above action level
Reported level
2.52 mg/L
Action level
1.3 mg/L

194% of the listed benchmark

Monitoring period: Jul 1, 1993 to Dec 31, 1993

Violation history (0)

No record returned in this imported window. This is not a guarantee of tap-water safety.

Marlborough Estates

NH1482010 · Groundwater · 100 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →
Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Copper (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Above action level
Reported level
1.535 mg/L
Action level
1.3 mg/L

118% of the listed benchmark

Monitoring period: Jul 1, 1993 to Dec 31, 1993

Violation history (2)
Imported violation history for Marlborough Estates
RuleStatusPeriod
TTHMResolvedJul 1, 2025 to Oct 1, 2025
Total Haloacetic Acids (HAA5)ResolvedJul 1, 2025 to Oct 1, 2025

City summary

What the indexed records say

Marlborough has 1 published ZIP profile across Cheshire County. The regional-evidence median is 55 PPM. The city does not meet the stricter comparison standard.

Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

Hardness distribution

How local ZIP estimates compare

Soft1 ZIP
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard0 ZIPs

1 of 1 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
11.5 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Apr 18, 2017 to Sep 25, 2019.

ZIP directory

Water reports in Marlborough

Open a ZIP for site-level provenance and measurements.

ZIP code

03455

Soft

55.2 PPM

Nearest site
11.5 mi
Confidence
Low

View full ZIP evidence →

Practical next steps

Move from index to evidence

  1. 1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
  2. 2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
  3. 3. Use a measured hardness result. Confirm health concerns or treatment sizing with the right method.

Questions people ask

About water in Marlborough

Is the water hard?

Check the utility-reported result above when available. Nearby environmental samples cannot establish tap-water hardness. Ask your provider or test your tap.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.