How hard is the water in Brookhaven, NY?

Utility-reported hardness is unavailable in this index. Regional environmental samples cannot establish tap-water hardness. Ask your provider or test your tap.

Local water dashboard

Official source aggregation

Water quality in Brookhaven, NY 11719

Q: Is tap water safe in Brookhaven?

EPA SDWIS shows no active health-based violation in this profile's reporting window. That is not the same as proving every contaminant is absent, and federal data can lag state and utility records.

Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Suffolk County.

No active health-based violation reported

Largest possible serving system: Suffolk County Water Authority
Source water: Groundwater
County: Suffolk County
Profile updated: Jun 25, 2026

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 →

At a glance

What the current records say

EPA quarter 2026Q2

Utility-reported hardness

Unavailable

Ask your provider or test your tap

All possible systems

No active flag

0 active health-based records

Measurements by utility

Choose your provider

Each result belongs to a specific system.

Utility match

4 systems

Serves 1,100,000 people system-wide

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.

Suffolk County Water Authority

NY5110526 · Groundwater · 1,100,000 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.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.0013 mg/L
Action level: 0.015 mg/L

8% of the listed benchmark

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

Violation history (0)

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

Brookhaven National Laboratory

NY5111891 · Groundwater · 3,500 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.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.0027 mg/L
Action level: 0.015 mg/L

18% of the listed benchmark

Monitoring period: Jan 1, 2024 to Dec 31, 2024

Violation history (0)

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

Seaview Water Company

NY5110600 · Groundwater · 1,400 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.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.0045 mg/L
Action level: 0.015 mg/L

30% of the listed benchmark

Monitoring period: Jan 1, 2021 to Dec 31, 2023

Violation history (2)

Imported violation history for Seaview Water Company
Rule	Status	Period
Radium-226	Resolved	Jan 1, 2022 to Mar 31, 2022
Radium-228	Archived	Jan 1, 2022 to Mar 31, 2022

Calverton Hills Owners Association

NY5112134 · Groundwater · 897 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.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

Monitoring period: Jan 1, 2021 to Dec 31, 2023

Violation history (30)

Imported violation history for Calverton Hills Owners Association
Rule	Status	Period
Endrin	Resolved	Jan 1, 2023 to Dec 31, 2023
BHC-GAMMA	Resolved	Jan 1, 2023 to Dec 31, 2023
Methoxychlor	Resolved	Jan 1, 2023 to Dec 31, 2023
Toxaphene	Resolved	Jan 1, 2023 to Dec 31, 2023
Simazine	Resolved	Jan 1, 2023 to Dec 31, 2023
Di(2-ethylhexyl) phthalate	Resolved	Jan 1, 2023 to Dec 31, 2023
Picloram	Resolved	Jan 1, 2023 to Dec 31, 2023
Dinoseb	Resolved	Jan 1, 2023 to Dec 31, 2023
Hexachlorocyclopentadiene	Resolved	Jan 1, 2023 to Dec 31, 2023
Aldicarb sulfoxide	Resolved	Jan 1, 2023 to Dec 31, 2023
Aldicarb sulfone	Resolved	Jan 1, 2023 to Dec 31, 2023
Carbofuran	Resolved	Jan 1, 2023 to Dec 31, 2023
Aldicarb	Resolved	Jan 1, 2023 to Dec 31, 2023
LASSO	Resolved	Jan 1, 2023 to Dec 31, 2023
Heptachlor	Resolved	Jan 1, 2023 to Dec 31, 2023
Heptachlor epoxide	Resolved	Jan 1, 2023 to Dec 31, 2023
2,4-D	Resolved	Jan 1, 2023 to Dec 31, 2023
2,4,5-TP	Resolved	Jan 1, 2023 to Dec 31, 2023
Benzo(a)pyrene	Resolved	Jan 1, 2023 to Dec 31, 2023
Total Polychlorinated Biphenyls (PCB)	Resolved	Jan 1, 2023 to Dec 31, 2023
Chlordane	Resolved	Jan 1, 2023 to Dec 31, 2023
Di(2-ethylhexyl) adipate	Resolved	Jan 1, 2023 to Dec 31, 2023
ETHYLENE DIBROMIDE	Resolved	Jan 1, 2023 to Dec 31, 2023
Dalapon	Resolved	Jan 1, 2023 to Dec 31, 2023
HEXACHLOROBENZENE	Resolved	Jan 1, 2023 to Dec 31, 2023
OXAMYL	Resolved	Jan 1, 2023 to Dec 31, 2023
Atrazine	Resolved	Jan 1, 2023 to Dec 31, 2023
Pentachlorophenol	Resolved	Jan 1, 2023 to Dec 31, 2023
Asbestos	Resolved	Jan 1, 2021 to May 31, 2022
Lead and Copper Rule	Unaddressed	Jul 1, 1994

Hardness meter

What does nearby environmental evidence show?

Soft

41.1

PPM as CaCO₃

Soft

PPM

41.1

GPG

2.4

Regional environmental evidence

USGS hardness classification scale

41.1 PPM

Soft
0–60Moderate
61–120Hard
121–180Very hard
181+

Parts per million

41.1

mg/L as CaCO₃ equivalent

Grains per gallon

2.4

1 GPG ≈ 17.1 PPM

How to use regional evidence

These samples describe nearby environmental water. They cannot establish whether your tap water is soft or hard. Use a utility result or a tap test for appliance settings and treatment sizing.

USGS sites used

Nearest site

3 mi

Observation range

Aug 16, 2016–Aug 11, 2025

Regional evidence confidence

High

Median of the latest source-type-aligned hardness observation at each monitoring site within 25 miles. Nearest monitoring location: S 65603. 1 (Well).USGS source documentation ↗Evidence tier: Regional environmental evidence. This value is not used as proof of the serving utility's treated-water hardness.

Regional context

Is 11719 typical?

These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.

Brookhaven median

41 PPM

About the same

1 indexed ZIP readings · Range 41.1–41.1 PPM

New York median

147 PPM

106 PPM lower

810 indexed ZIP readings · Range 5.5–1070 PPM

Evidence-first next steps

Confirm the problem before choosing treatment

This profile can help you ask the right question. It cannot select equipment for a property without a current result from the serving utility or the tap.

Confirm the serving system

ZIP boundaries and utility service areas do not perfectly match. Verify the system on a water bill before relying on system-wide records.

Read the current utility report

Use the current Consumer Confidence Report for treated-water results and official notices.

Find an official utility report →

Test for the decision you face

Use a tap hardness test before sizing a softener. For health concerns, use a certified laboratory and the correct sampling protocol.

Convert your hardness test result →

Frequently asked

Water questions for Brookhaven

Is tap water safe in Brookhaven?+

EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.

How hard is the water?+

Utility-reported hardness is unavailable in this index. Regional samples do not establish tap-water hardness. Ask your provider or test your tap.

Do I need a water softener?+

Confirm hardness at your tap and consider actual scale or spotting before choosing treatment. Regional environmental values cannot determine whether you need a softener. A softener addresses hardness, not every contaminant.