City water profile

Water hardness in Cohasset

Find official utility reports, understand hardness, and check the water system serving your home in Cohasset, Massachusetts.

Utility-reported hardness

Not yet available

Check your provider and source →

State comparison: Unavailable
Evidence comparison rank: —
Matched utilities: 1
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.

Cohasset Water Dept

MA4065000 · Surface water · 7,555 people served system-wide

EPA SDWIS explicitly lists this ZIP in the system's served geography.

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.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.002 mg/L
Action level: 0.015 mg/L

13% of the listed benchmark

Monitoring period: Jan 1, 2023 to Dec 31, 2025

Violation history (32)

Imported violation history for Cohasset Water Dept
Rule	Status	Period
Consumer Confidence Rule	Resolved	Jul 1, 2022 to Aug 15, 2022
Interim Enhanced Surface Water Treatment Rule	Archived	Jun 1, 2021 to Jun 30, 2021
Carbofuran	Archived	Apr 1, 2021 to Jun 30, 2021
Chlordane	Archived	Apr 1, 2021 to Jun 30, 2021
Endrin	Archived	Apr 1, 2021 to Jun 30, 2021
ETHYLENE DIBROMIDE	Archived	Apr 1, 2021 to Jun 30, 2021
Heptachlor	Archived	Apr 1, 2021 to Jun 30, 2021
Pentachlorophenol	Archived	Apr 1, 2021 to Jun 30, 2021
Toxaphene	Archived	Apr 1, 2021 to Jun 30, 2021
2,4,5-TP	Archived	Apr 1, 2021 to Jun 30, 2021
BHC-GAMMA	Archived	Apr 1, 2021 to Jun 30, 2021
Total Polychlorinated Biphenyls (PCB)	Archived	Apr 1, 2021 to Jun 30, 2021
1,2-DIBROMO-3-CHLOROPROPANE	Archived	Apr 1, 2021 to Jun 30, 2021
Dalapon	Archived	Apr 1, 2021 to Jun 30, 2021
Di(2-ethylhexyl) phthalate	Archived	Apr 1, 2021 to Jun 30, 2021
Dinoseb	Archived	Apr 1, 2021 to Jun 30, 2021
Diquat	Archived	Apr 1, 2021 to Jun 30, 2021
HEXACHLOROBENZENE	Archived	Apr 1, 2021 to Jun 30, 2021
Hexachlorocyclopentadiene	Archived	Apr 1, 2021 to Jun 30, 2021
Simazine	Archived	Apr 1, 2021 to Jun 30, 2021
LASSO	Archived	Apr 1, 2021 to Jun 30, 2021
Glyphosate	Archived	Apr 1, 2021 to Jun 30, 2021
Atrazine	Archived	Apr 1, 2021 to Jun 30, 2021
2,3,7,8-TCDD	Archived	Apr 1, 2021 to Jun 30, 2021
Picloram	Archived	Apr 1, 2021 to Jun 30, 2021
2,4-D	Archived	Apr 1, 2021 to Jun 30, 2021
Methoxychlor	Archived	Apr 1, 2021 to Jun 30, 2021
Benzo(a)pyrene	Archived	Apr 1, 2021 to Jun 30, 2021
OXAMYL	Archived	Apr 1, 2021 to Jun 30, 2021
Di(2-ethylhexyl) adipate	Archived	Apr 1, 2021 to Jun 30, 2021
Endothall	Archived	Apr 1, 2021 to Jun 30, 2021
Heptachlor epoxide	Archived	Apr 1, 2021 to Jun 30, 2021

City summary

What the indexed records say

Cohasset has 1 published ZIP profile across Norfolk County. The regional-evidence median is 54 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.

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: 0.9 miles
Profiles with evidence: 1/1

Confidence labels

High: 1Moderate: 0Low: 0

Observation window: Aug 1, 2016 to Jun 8, 2026.

ZIP directory

Water reports in Cohasset

Open a ZIP for site-level provenance and measurements.

ZIP code

02025

Soft

53.7 PPM

Nearest site: 0.9 mi
Confidence: High

View full ZIP evidence →

Practical next steps

Move from index to evidence

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

Continue comparing

Other Massachusetts communities

Avon

Norfolk County

29 PPM median

Bellingham

Norfolk County

59 PPM median

Braintree Town

Norfolk County

70 PPM median

Brookline

Norfolk County

75 PPM median

Canton

Norfolk County

65 PPM median

Dedham

Norfolk County

68 PPM median

Search all 302 Massachusetts cities →

Questions people ask

About water in Cohasset

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.