Utility-reported hardness
Unavailable
Ask your provider or test your tap
Local water dashboard
Official source aggregationWater quality in Hempstead, NY 11550
Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Nassau County.
No active health-based violation reported
- Largest possible serving system
- Liberty Utilities New York - Lynbrook
- Source water
- Groundwater
- County
- Nassau County
- Profile updated
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 →At a glance
What the current records say
EPA quarter 2026Q2
All possible systems
No active flag
0 active health-based records
Measurements by utility
Each result belongs to a specific system.
Utility match
9 systems
Serves 220,000 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.
Liberty Utilities New York - Lynbrook
NY2902835 · Groundwater · 220,000 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
- Reported level
- 0.0042 mg/L
- Action level
- 0.015 mg/L
28% of the listed benchmark
Monitoring period: Jan 1, 2025 to Jun 30, 2025
Violation history (3)
| Rule | Status | Period |
|---|---|---|
| Lead and Copper RuleHealth-based | Resolved | Jul 1, 2024 to Dec 31, 2024 |
| Lead and Copper RuleHealth-based | Resolved | Jan 1, 2024 to Jun 30, 2024 |
| Lead and Copper RuleHealth-based | Resolved | Jul 1, 2023 to Dec 31, 2023 |
Liberty Utilities New York - Merrick
NY2902840 · Groundwater · 135,000 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
- Reported level
- 0 mg/L
- Action level
- 0.015 mg/L
0% of the listed benchmark
Monitoring period: Jan 1, 2025 to Jun 30, 2025
Violation history (3)
| Rule | Status | Period |
|---|---|---|
| Lead and Copper RuleHealth-based | Resolved | Jul 1, 2024 to Dec 31, 2024 |
| Lead and Copper RuleHealth-based | Resolved | Jan 1, 2024 to Jun 30, 2024 |
| Lead and Copper RuleHealth-based | Resolved | Jul 1, 2023 to Dec 31, 2023 |
Wa Of Western Nassau
NY2902830 · Groundwater · 120,000 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
- Reported level
- 0.0014 mg/L
- Action level
- 0.015 mg/L
9% of the listed benchmark
Monitoring period: Jan 1, 2022 to Dec 31, 2024
Violation history (0)
No record returned in this imported window. This is not a guarantee of tap-water safety.
Town Of Hempstead Water Department
NY2900000 · Groundwater · 110,000 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
- Reported level
- 0.001 mg/L
- Action level
- 0.015 mg/L
7% of the listed benchmark
Monitoring period: Jan 1, 2021 to Dec 31, 2023
Violation history (0)
No record returned in this imported window. This is not a guarantee of tap-water safety.
Hempstead (v)
NY2902827 · Groundwater · 56,000 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
- Reported level
- 0 mg/L
- Action level
- 0.015 mg/L
0% of the listed benchmark
Monitoring period: Jul 1, 2025 to Dec 31, 2025
Violation history (1)
| Rule | Status | Period |
|---|---|---|
| LEAD AND COPPER RULE REVISIONS | Resolved | Oct 17, 2024 to Jan 3, 2025 |
West Hempstead Wd
NY2902857 · Groundwater · 32,031 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
- Reported level
- 0.0011 mg/L
- Action level
- 0.015 mg/L
7% of the listed benchmark
Monitoring period: Jan 1, 2021 to Dec 31, 2023
Violation history (1)
| Rule | Status | Period |
|---|---|---|
| Picloram | Resolved | Oct 1, 2023 to Mar 31, 2024 |
Franklin Square Wd
NY2902822 · Groundwater · 20,000 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
- 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 (28)
| Rule | Status | Period |
|---|---|---|
| Methoxychlor | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Toxaphene | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Dalapon | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Picloram | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Dinoseb | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Hexachlorocyclopentadiene | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Aldicarb sulfone | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Carbofuran | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Aldicarb | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| LASSO | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Heptachlor | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| 2,4-D | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Pentachlorophenol | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Total Polychlorinated Biphenyls (PCB) | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Chlordane | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Atrazine | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| ETHYLENE DIBROMIDE | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Benzo(a)pyrene | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Simazine | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Aldicarb sulfoxide | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| HEXACHLOROBENZENE | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| OXAMYL | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Di(2-ethylhexyl) adipate | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| 2,4,5-TP | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Endrin | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| BHC-GAMMA | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Heptachlor epoxide | Resolved | Jan 1, 2022 to Jun 30, 2023 |
| Di(2-ethylhexyl) phthalate | Resolved | Jan 1, 2022 to Jun 30, 2023 |
Lido-Point Lookout Wd
NY2902828 · Groundwater · 2,000 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
- Reported level
- 0.0014 mg/L
- Action level
- 0.015 mg/L
9% of the listed benchmark
Monitoring period: Jan 1, 2021 to Dec 31, 2023
Violation history (0)
No record returned in this imported window. This is not a guarantee of tap-water safety.
Cathedral Gardens Wd
NY2902859 · Groundwater · 1,500 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
- Reported level
- 0.0013 mg/L
- Action level
- 0.015 mg/L
9% of the listed benchmark
Monitoring period: Jan 1, 2021 to Dec 31, 2023
Violation history (0)
No record returned in this imported window. This is not a guarantee of tap-water safety.
Hardness meter
What does nearby environmental evidence show?
66.4
PPM as CaCO₃
Moderately Hard
PPM
66.4
GPG
3.9
Regional environmental evidence
USGS hardness classification scale
66.4 PPM
Soft
0–60Moderate
61–120Hard
121–180Very hard
181+
0–60Moderate
61–120Hard
121–180Very hard
181+
Parts per million
66.4
mg/L as CaCO₃ equivalent
Grains per gallon
3.9
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
66
Nearest site
1.1 mi
Observation range
Aug 22, 2016–Dec 17, 2025
Regional evidence confidence
High
Median of the latest source-type-aligned hardness observation at each monitoring site within 25 miles. Nearest monitoring location: N 13374. 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 11550 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Hempstead median
66 PPM
About the same1 indexed ZIP readings · Range 66.4–66.4 PPM
New York median
147 PPM
81 PPM lower810 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 Hempstead
Is tap water safe in Hempstead?+
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.