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 Sierra 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
3 active health-based records
Measurements by utility
Each result belongs to a specific system.
Utility match
2 systems
Serves 6,783 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.
NM3514327 · Groundwater · 6,783 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
3 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
6% of the listed benchmark
Monitoring period: Jan 1, 2021 to Dec 31, 2023
| Rule | Status | Period |
|---|---|---|
| Public Notice | Resolved | Nov 30, 2025 to Dec 28, 2025 |
| Groundwater RuleHealth-based | Resolved | Sep 29, 2025 to Dec 22, 2025 |
| Groundwater RuleHealth-based | Resolved | Sep 29, 2025 to Dec 22, 2025 |
| Groundwater RuleHealth-based | Resolved | Sep 29, 2025 to Jan 20, 2026 |
| Groundwater RuleHealth-based | Resolved | Sep 29, 2025 to Dec 22, 2025 |
| Groundwater RuleHealth-based | Resolved | Sep 29, 2025 to Dec 22, 2025 |
| Groundwater RuleHealth-based | Unaddressed | Sep 29, 2025 |
| Groundwater RuleHealth-based | Unaddressed | Sep 29, 2025 |
| Groundwater RuleHealth-based | Resolved | Sep 29, 2025 to Jan 20, 2026 |
| Groundwater RuleHealth-based | Resolved | Sep 29, 2025 to Dec 22, 2025 |
| Groundwater RuleHealth-based | Resolved | Sep 29, 2025 to Jan 16, 2026 |
| Groundwater RuleHealth-based | Resolved | Sep 29, 2025 to Dec 22, 2025 |
| Groundwater RuleHealth-based | Unaddressed | Sep 29, 2025 |
| Groundwater RuleHealth-based | Resolved | Sep 29, 2025 to Dec 22, 2025 |
| Groundwater RuleHealth-based | Resolved | Sep 29, 2025 to Jan 20, 2026 |
| Groundwater RuleHealth-based | Resolved | Sep 29, 2025 to Dec 22, 2025 |
| Groundwater RuleHealth-based | Resolved | Sep 29, 2025 to Jan 20, 2026 |
| Groundwater RuleHealth-based | Resolved | Sep 29, 2025 to Jan 20, 2026 |
| Chlorine | Resolved | Oct 1, 2021 to Dec 31, 2021 |
NM3520027 · Groundwater · 45 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 Jun 30, 2025
EPA SDWIS reported health-based violation
163% of the listed benchmark
Monitoring period: Jan 1, 2026 to Mar 31, 2026
| Rule | Status | Period |
|---|---|---|
| Groundwater Rule | Resolved | Jan 11, 2026 to Feb 20, 2026 |
| FluorideHealth-based | Archived | Jan 1, 2026 to Mar 31, 2026 |
| Public Notice | Resolved | Dec 15, 2025 to Feb 11, 2026 |
| FluorideHealth-based | Archived | Oct 1, 2025 to Dec 31, 2025 |
| Lead and Copper Rule | Unaddressed | Sep 29, 2025 |
| FluorideHealth-based | Archived | Jul 1, 2025 to Sep 30, 2025 |
| Public Notice | Resolved | Jun 28, 2025 to Nov 14, 2025 |
| Public Notice | Resolved | Jun 17, 2025 to Sep 26, 2025 |
| Public Notice | Resolved | Apr 24, 2025 to Nov 5, 2025 |
| FluorideHealth-based | Archived | Apr 1, 2025 to Jun 30, 2025 |
| Lead and Copper Rule | Unaddressed | Apr 1, 2025 |
| Public Notice | Resolved | Feb 18, 2025 to Jun 6, 2025 |
| FluorideHealth-based | Archived | Jan 1, 2025 to Mar 31, 2025 |
| Public Notice | Resolved | Nov 9, 2024 to Jun 6, 2025 |
| FluorideHealth-based | Archived | Oct 1, 2024 to Dec 31, 2024 |
| Consumer Confidence Rule | Resolved | Oct 1, 2024 to Nov 19, 2024 |
| Public Notice | Resolved | Aug 9, 2024 to Jun 6, 2025 |
| Lead and Copper Rule | Resolved | Jul 1, 2024 to Sep 3, 2024 |
| FluorideHealth-based | Archived | Jul 1, 2024 to Sep 30, 2024 |
| Public Notice | Resolved | May 25, 2024 to Nov 14, 2025 |
| Public Notice | Resolved | May 9, 2024 to Jun 6, 2025 |
| FluorideHealth-based | Archived | Apr 1, 2024 to Jun 30, 2024 |
| FluorideHealth-based | Archived | Jan 1, 2024 to Mar 31, 2024 |
| Lead and Copper Rule | Resolved | Jan 1, 2024 to Sep 3, 2024 |
| FluorideHealth-based | Archived | Oct 1, 2023 to Dec 31, 2023 |
| Lead and Copper Rule | Resolved | Sep 29, 2023 to Dec 8, 2025 |
| FluorideHealth-based | Archived | Jul 1, 2023 to Sep 30, 2023 |
| FluorideHealth-based | Archived | Apr 1, 2023 to Jun 30, 2023 |
| Public Notice | Resolved | Mar 8, 2023 to Oct 4, 2023 |
| Lead and Copper Rule | Resolved | Jan 1, 2023 to Sep 3, 2024 |
| Lead and Copper Rule | Resolved | Sep 29, 2022 to Mar 6, 2024 |
| Public Notice | Resolved | Aug 6, 2022 to Aug 26, 2022 |
| Public Notice | Resolved | Jun 12, 2022 to Feb 7, 2024 |
| Public Notice | Resolved | Apr 11, 2022 to Apr 11, 2022 |
| FluorideHealth-based | Archived | Apr 1, 2022 to Jun 30, 2022 |
| FluorideHealth-based | Archived | Apr 1, 2022 to Jun 30, 2022 |
| Public Notice | Resolved | Mar 23, 2022 to Jul 26, 2022 |
| Public Notice | Resolved | Jan 2, 2022 to Aug 11, 2025 |
| FluorideHealth-based | Archived | Jan 1, 2022 to Mar 31, 2022 |
| FluorideHealth-based | Archived | Jan 1, 2022 to Mar 31, 2022 |
| Public Notice | Resolved | Dec 3, 2021 to Aug 11, 2025 |
| FluorideHealth-based | Archived | Oct 1, 2021 to Dec 31, 2021 |
| FluorideHealth-based | Archived | Oct 1, 2021 to Dec 31, 2021 |
| Consumer Confidence Rule | Resolved | Oct 1, 2021 to Nov 5, 2024 |
| Public Notice | Resolved | Jul 23, 2021 to Nov 1, 2021 |
| FluorideHealth-based | Archived | Jul 1, 2021 to Sep 30, 2021 |
| FluorideHealth-based | Archived | Jul 1, 2021 to Sep 30, 2021 |
| Consumer Confidence Rule | Resolved | Jul 1, 2021 to Jan 28, 2022 |
| Public Notice | Resolved | May 16, 2021 to May 11, 2023 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Public Notice | Resolved | May 7, 2021 to Nov 1, 2021 |
| Revised Total Coliform Rule | Resolved | Apr 1, 2021 to Apr 30, 2021 |
| Chlorine | Resolved | Apr 1, 2021 to Jun 30, 2021 |
| TTHM | Resolved | Jan 1, 2021 to Dec 31, 2021 |
| Total Haloacetic Acids (HAA5) | Resolved | Jan 1, 2021 to Dec 31, 2021 |
| Public Notice | Unaddressed | Oct 20, 2013 |
| Public Notice | Unaddressed | Aug 10, 2013 |
| Public Notice | Unaddressed | Jul 20, 2013 |
| Public Notice | Unaddressed | Jan 17, 2013 |
| Public Notice | Unaddressed | Oct 10, 2010 |
Hardness estimate unavailable
We did not find enough qualifying recent USGS hardness observations within 25 miles of this ZIP centroid. We leave the value blank instead of substituting a state average. Ask the serving utility or test the household tap for a property-specific result.
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 →Ask the utility for hardness or test at the tap. For health concerns, use a certified laboratory and targeted analysis.
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 3 active health-based violations 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.