Utility-reported hardness
Unavailable
Ask your provider or test your tap
Local water dashboard
Official source aggregationRegional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for St. Johns County.
Your tap water
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
EPA quarter 2026Q2
Utility-reported hardness
Unavailable
Ask your provider or test your tap
All possible systems
Review needed
1 active health-based record
Measurements by utility
Each result belongs to a specific system.
Utility match
8 systems
Serves 66,953 people system-wide
Match the name on your water bill
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.
FL2554447 · Groundwater · 66,953 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 →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.
EPA SDWIS Lead and Copper Rule samples
4% of the listed benchmark
Monitoring period: Jan 1, 2024 to Dec 1, 2024
| Rule | Status | Period |
|---|---|---|
| Revised Total Coliform Rule | Archived | Nov 1, 2025 to Nov 30, 2025 |
| Revised Total Coliform Rule | Resolved | Feb 1, 2025 to Feb 28, 2025 |
| Revised Total Coliform Rule | Resolved | Dec 1, 2024 to Jan 30, 2025 |
| Revised Total Coliform Rule | Resolved | Sep 1, 2024 to Sep 30, 2024 |
| Consumer Confidence Rule | Resolved | Jul 1, 2024 to Aug 10, 2024 |
| Revised Total Coliform Rule | Resolved | Feb 1, 2024 to Feb 29, 2024 |
FL2554471 · Groundwater · 48,040 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 →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.
EPA SDWIS Lead and Copper Rule samples
0% of the listed benchmark
Monitoring period: Jul 1, 2025 to Dec 1, 2025
| Rule | Status | Period |
|---|---|---|
| Revised Total Coliform Rule | Archived | Jul 1, 2025 to Jul 31, 2025 |
| Consumer Confidence Rule | Unaddressed | Jul 1, 2024 |
FL2550210 · Groundwater · 43,069 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 →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.
EPA SDWIS Lead and Copper Rule samples
5% of the listed benchmark
Monitoring period: Jan 1, 2023 to Dec 1, 2023
| Rule | Status | Period |
|---|---|---|
| Consumer Confidence Rule | Unaddressed | Jul 1, 2024 |
| Revised Total Coliform Rule | Archived | May 1, 2024 to May 31, 2024 |
| Revised Total Coliform Rule | Archived | May 1, 2023 to May 31, 2023 |
| Lead and Copper Rule | Resolved | Jan 1, 2023 to May 24, 2024 |
| Consumer Confidence Rule | Unaddressed | Jul 1, 2022 |
| Revised Total Coliform Rule | Resolved | Mar 1, 2022 to Mar 31, 2022 |
| Revised Total Coliform Rule | Unaddressed | Oct 1, 2019 |
FL2554475 · Groundwater · 14,790 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 →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.
EPA SDWIS Lead and Copper Rule samples
7% of the listed benchmark
Monitoring period: Jan 1, 2024 to Dec 1, 2024
| Rule | Status | Period |
|---|---|---|
| Revised Total Coliform Rule | Unaddressed | Sep 1, 2024 |
| Consumer Confidence Rule | Unaddressed | Jul 1, 2024 |
| Revised Total Coliform Rule | Resolved | Dec 1, 2022 to Dec 31, 2022 |
| Total Haloacetic Acids (HAA5) | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| Lead and Copper Rule | Resolved | Jan 1, 2022 to Mar 20, 2025 |
| TTHM | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| TTHM | Resolved | Oct 1, 2021 to Dec 31, 2021 |
| Total Haloacetic Acids (HAA5) | Resolved | Oct 1, 2021 to Dec 31, 2021 |
FL2550812 · Groundwater · 4,200 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 →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.
EPA SDWIS Lead and Copper Rule samples
4% of the listed benchmark
Monitoring period: Jan 1, 2025 to Dec 1, 2025
| Rule | Status | Period |
|---|---|---|
| Consumer Confidence Rule | Resolved | Jul 1, 2024 to Jan 7, 2025 |
FL2551370 · Groundwater · 858 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
1 reported active health-based record(s) for this system
Find this utility’s official report →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.
EPA SDWIS Lead and Copper Rule samples
15% of the listed benchmark
Monitoring period: Jan 1, 2024 to Dec 1, 2024
| Rule | Status | Period |
|---|---|---|
| LEAD AND COPPER RULE REVISIONSHealth-based | Unaddressed | Feb 1, 2025 |
| LEAD AND COPPER RULE REVISIONS | Unaddressed | Feb 1, 2025 |
| Consumer Confidence Rule | Resolved | Jul 1, 2024 to Jul 9, 2024 |
| TTHM | Archived | Jan 1, 2024 to Dec 31, 2024 |
| Total Haloacetic Acids (HAA5) | Archived | Jan 1, 2024 to Dec 31, 2024 |
| Lead and Copper Rule | Resolved | Jan 1, 2022 to Feb 25, 2025 |
| Consumer Confidence Rule | Resolved | Jul 1, 2021 to Oct 19, 2021 |
| Total Haloacetic Acids (HAA5) | Resolved | Jan 1, 2021 to Dec 7, 2021 |
| TTHM | Resolved | Jan 1, 2021 to Dec 7, 2021 |
FL2554166 · Groundwater · 312 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 →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.
EPA SDWIS Lead and Copper Rule samples
0% of the listed benchmark
Monitoring period: Jan 1, 2023 to Dec 1, 2023
| Rule | Status | Period |
|---|---|---|
| Revised Total Coliform Rule | Unaddressed | Dec 1, 2021 |
| Total Haloacetic Acids (HAA5) | Archived | Oct 1, 2021 to Dec 31, 2021 |
| TTHM | Archived | Oct 1, 2021 to Dec 31, 2021 |
| Total Haloacetic Acids (HAA5) | Archived | Jan 1, 2021 to Mar 31, 2021 |
FL2551459 · Groundwater · 96 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 →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.
EPA SDWIS Lead and Copper Rule samples
0% of the listed benchmark
Monitoring period: Jan 1, 2025 to Dec 1, 2025
| Rule | Status | Period |
|---|---|---|
| Consumer Confidence Rule | Resolved | Jul 1, 2024 to Feb 18, 2026 |
| Total Haloacetic Acids (HAA5) | Archived | Jan 1, 2024 to Dec 31, 2024 |
| TTHM | Archived | Jan 1, 2024 to Dec 31, 2024 |
Hardness meter
357.5
PPM as CaCO₃
Very Hard
PPM
357.5
GPG
20.9
Regional environmental evidence
USGS hardness classification scale
357.5 PPM
Parts per million
357.5
mg/L as CaCO₃ equivalent
Grains per gallon
20.9
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
2
Nearest site
6.1 mi
Observation range
Nov 20, 2019–Nov 21, 2019
Regional evidence confidence
Low
Median of the latest source-type-aligned hardness observation at each monitoring site within 25 miles. Nearest monitoring location: St Augustine SA Well 14 AAC2799 (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
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
St. Augustine median
336 PPM
22 PPM higher2 indexed ZIP readings · Range 313.5–357.5 PPM
Florida median
280 PPM
78 PPM higher498 indexed ZIP readings · Range 42.2–2300 PPM
Evidence-first next steps
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.
ZIP boundaries and utility service areas do not perfectly match. Verify the system on a water bill before relying on system-wide records.
An active health-based record is present. Follow the utility's current notice and public-health instructions.
Find an official utility report →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 →Nearby indexed reports
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
EPA ECHO reports 1 active health-based violation among the associated community water systems. Review the affected utility's current notice and Consumer Confidence Report.
Utility-reported hardness is unavailable in this index. Regional samples do not establish tap-water hardness. Ask your provider or test your tap.
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.