PWSID CA2000544
MADERA CO MD1-HIDDEN LAKE ESTATES
Community water system based in Madera, CA
Service area on file with EPA: Madera County. EPA's recorded service area can be incomplete for regional authorities. The cities and counties above are what the utility has filed with EPA; the utility may serve additional areas.
- Population served
- 162
- Source
- Surface water
- Status
- Active
At a glance
1 finding worth watching
-
Public health experts agree no amount of lead in drinking water is safe. Even low levels can affect children's brain development.
Most recent lead and copper test · See details below
-
This utility's inventory reports no confirmed lead service lines and a low share of unclassified lines.
From the utility's published inventory · See details below
-
CDC's My Water's Fluoride listing does not report this system as fluoridating its drinking water.
Per CDC My Water's Fluoride · See details below
Past 5 years: 32 health-based violations on file, all marked Resolved or Archived. See compliance history below.
Risk classification follows EPA's published values for safe drinking water, with caution and concern bands reviewed by a clinician. Past resolved violations do not influence this card. See methodology.
Lead service line inventory
Utility reports no confirmed lead service lines
MADERA CO MD1-HIDDEN LAKE ESTATES reports 0 confirmed lead service lines, 49 non-lead, 0 unknown (total 49) in the EPA SDWIS service line inventory (2026Q1).
- 0 confirmed lead service lines
- 0 galvanized requiring replacement (LCRI treats these as lead)
- 0 unknown (0.0% of total)
- 49 confirmed non-lead (100.0%)
- 49 total service lines in the system
What to do if your service line might be lead
- Ask your utility to check the service-line classification for your specific address. Many utilities provide a public address-lookup tool linked from the inventory page.
- Get on the replacement queue. Under the LCRI, utilities must replace all lead and galvanized-requiring- replacement lines within 10 years (clock generally starts November 2027). Some prioritize requests.
- Until the line is replaced: flush the tap 30 seconds after long stagnation, use cold water for drinking and cooking, and consider an NSF/ANSI 53 lead-rated tap filter.
- Talk to your clinician about a blood lead test for anyone in the home, especially a pregnant person or a child under 6. Lead in drinking water guide.
Inventory data sourced from MADERA CO MD1-HIDDEN LAKE ESTATES ( retrieved May 24, 2026 ; curator confidence: high ). Confirmed against the original source automatically each month; see methodology.
Lead and copper test results
The most recent measurement per contaminant from EPA's Lead and Copper Rule sampling.
Why only lead and copper, and not arsenic, nitrate, or others?
EPA's bulk SDWIS download is the only nationwide per-system sample data they publish, and it only includes the Lead and Copper Rule table. Values for other regulated contaminants (TTHMs, nitrate, arsenic, etc.) appear on this page only when they trigger a violation. For the full per-system contaminant suite, see the utility's annual Consumer Confidence Report (link further down the page).
| Contaminant | Most recent | Date | Risk |
|---|---|---|---|
| PB90 | 0.0008 mg/L | December 31, 2025 | Detected (no safe level) |
Data from EPA SDWIS (Lead and Copper Rule sample table) , last refreshed May 24, 2026.
Fluoride
Per CDC My Water's Fluoride
MADERA CO MD1-HIDDEN LAKE ESTATES does not add fluoride to its drinking water.
This system has not reported adding fluoride to its water on CDC's My Water's Fluoride listing. Natural fluoride may still be present at trace levels from the source water; the utility's annual water quality report has the latest measured concentration.
Source: CDC My Water's Fluoride, listed under Md#01 Hidden Lake Estates (Madera County). Verify on CDC's site .
Area context
Madera County, CA (2020 data)
- Community water systems
- 3 of 64 add fluoride
- Population on fluoridated water
- 606 of 116,636 (0.5%)
California statewide (2020 data)
- Population on fluoridated water
- 21,879,582 of 38,051,212 (57.5%)
- Community water systems adding fluoride
- 417 of 3,057
Data from CDC My Water's Fluoride (per-system status) , last refreshed May 19, 2026.
Data from CDC Water Fluoridation Reporting System (state and county aggregates) , last refreshed May 16, 2026.
Recorded contaminant measurements (from violations)
When this system exceeded a regulatory limit and EPA recorded the measured value, that value is shown here. These are not routine sample results: they are the values the violation was triggered on.
| Period | Contaminant | Measured | Federal MCL | Status |
|---|---|---|---|---|
| October 1, 2025 | Tthm | 0.1525MG/L | 0.08 MG/L | Health-based |
| October 1, 2025 | Total Haloacetic Acids (Haa5) | 0.102MG/L | 0.06 MG/L | Health-based |
| July 1, 2025 | Total Haloacetic Acids (Haa5) | 0.0965MG/L | 0.06 MG/L | Health-based |
| July 1, 2025 | Tthm | 0.14MG/L | 0.08 MG/L | Health-based |
| April 1, 2025 | Total Haloacetic Acids (Haa5) | 0.1425MG/L | 0.06 MG/L | Health-based |
| April 1, 2025 | Tthm | 0.0962MG/L | 0.08 MG/L | Health-based |
| January 1, 2025 | Total Haloacetic Acids (Haa5) | 0.0817MG/L | 0.06 MG/L | Health-based |
| January 1, 2025 | Tthm | 0.1175MG/L | 0.08 MG/L | Health-based |
| October 1, 2024 | Tthm | 0.1125MG/L | 0.08 MG/L | Health-based |
| October 1, 2024 | Total Haloacetic Acids (Haa5) | 0.09875MG/L | 0.06 MG/L | Health-based |
| July 1, 2024 | Total Haloacetic Acids (Haa5) | 0.117MG/L | 0.06 MG/L | Health-based |
| July 1, 2024 | Tthm | 0.132MG/L | 0.08 MG/L | Health-based |
| April 1, 2024 | Tthm | 0.123MG/L | 0.08 MG/L | Health-based |
| April 1, 2024 | Total Haloacetic Acids (Haa5) | 0.095MG/L | 0.06 MG/L | Health-based |
| January 1, 2024 | Total Haloacetic Acids (Haa5) | 0.13MG/L | 0.06 MG/L | Health-based |
| January 1, 2024 | Tthm | 0.135MG/L | 0.08 MG/L | Health-based |
| October 1, 2023 | Total Haloacetic Acids (Haa5) | 0.111MG/L | 0.06 MG/L | Health-based |
| October 1, 2023 | Tthm | 0.155MG/L | 0.08 MG/L | Health-based |
| July 1, 2023 | Total Haloacetic Acids (Haa5) | 0.109MG/L | 0.06 MG/L | Health-based |
| July 1, 2023 | Tthm | 0.144MG/L | 0.08 MG/L | Health-based |
| April 1, 2023 | Total Haloacetic Acids (Haa5) | 0.101MG/L | 0.06 MG/L | Health-based |
| April 1, 2023 | Tthm | 0.149MG/L | 0.08 MG/L | Health-based |
| January 1, 2023 | Total Haloacetic Acids (Haa5) | 0.15MG/L | 0.06 MG/L | Health-based |
| January 1, 2023 | Tthm | 0.22MG/L | 0.08 MG/L | Health-based |
| October 1, 2022 | Total Haloacetic Acids (Haa5) | 0.093UG/L | 0.06 UG/L | Health-based |
| October 1, 2022 | Tthm | 0.12UG/L | 0.08 UG/L | Health-based |
| July 1, 2022 | Tthm | 123UG/L | 0.08 UG/L | Health-based |
| July 1, 2022 | Total Haloacetic Acids (Haa5) | 93.3UG/L | 0.06 UG/L | Health-based |
| April 1, 2022 | Tthm | 140UG/L | 0.08 UG/L | Health-based |
| July 1, 2021 | Tthm | 160UG/L | 0.08 UG/L | Health-based |
| July 1, 2021 | Total Haloacetic Acids (Haa5) | 100UG/L | 0.06 UG/L | Health-based |
Data from EPA SDWIS (violation records) , last refreshed May 24, 2026.
Compliance history
EPA-recorded violations against this system over the last 5 years.
How to read this section
Health-based violations are when a measured limit was exceeded; the measured concentration is shown alongside the EPA federal limit where SDWIS published it. Monitoring and reporting items are paperwork issues (missed sample dates, late filings) that do not themselves indicate unsafe water.
32 resolved health-based violations in the last 5 years
All 32 health-based violations in the last 5 years are marked Resolved or Archived. Past violations do not represent current water quality.
| Period start | Contaminant | What happened | Measured level | Status |
|---|---|---|---|---|
| October 1, 2025 | Tthm | Maximum Contaminant Level Violation, Average | 0.152 MG/L
MCL 0.080 MG/L | Resolved |
| October 1, 2025 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.102 MG/L
MCL 0.060 MG/L | Resolved |
| July 1, 2025 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.097 MG/L
MCL 0.060 MG/L | Resolved |
| July 1, 2025 | Tthm | Maximum Contaminant Level Violation, Average | 0.140 MG/L
MCL 0.080 MG/L | Resolved |
| April 1, 2025 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.142 MG/L
MCL 0.060 MG/L | Resolved |
| April 1, 2025 | Tthm | Maximum Contaminant Level Violation, Average | 0.096 MG/L
MCL 0.080 MG/L | Resolved |
| January 1, 2025 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.082 MG/L
MCL 0.060 MG/L | Resolved |
| January 1, 2025 | Tthm | Maximum Contaminant Level Violation, Average | 0.117 MG/L
MCL 0.080 MG/L | Resolved |
| October 1, 2024 | Tthm | Maximum Contaminant Level Violation, Average | 0.113 MG/L
MCL 0.080 MG/L | Resolved |
| October 1, 2024 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.099 MG/L
MCL 0.060 MG/L | Resolved |
| July 1, 2024 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.117 MG/L
MCL 0.060 MG/L | Resolved |
| July 1, 2024 | Tthm | Maximum Contaminant Level Violation, Average | 0.132 MG/L
MCL 0.080 MG/L | Resolved |
| April 1, 2024 | Tthm | Maximum Contaminant Level Violation, Average | 0.123 MG/L
MCL 0.080 MG/L | Resolved |
| April 1, 2024 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.095 MG/L
MCL 0.060 MG/L | Resolved |
| January 1, 2024 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.130 MG/L
MCL 0.060 MG/L | Resolved |
| January 1, 2024 | Tthm | Maximum Contaminant Level Violation, Average | 0.135 MG/L
MCL 0.080 MG/L | Resolved |
| October 1, 2023 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.111 MG/L
MCL 0.060 MG/L | Resolved |
| October 1, 2023 | Tthm | Maximum Contaminant Level Violation, Average | 0.155 MG/L
MCL 0.080 MG/L | Resolved |
| July 1, 2023 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.109 MG/L
MCL 0.060 MG/L | Resolved |
| July 1, 2023 | Tthm | Maximum Contaminant Level Violation, Average | 0.144 MG/L
MCL 0.080 MG/L | Resolved |
| April 1, 2023 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.101 MG/L
MCL 0.060 MG/L | Resolved |
| April 1, 2023 | Tthm | Maximum Contaminant Level Violation, Average | 0.149 MG/L
MCL 0.080 MG/L | Resolved |
| March 1, 2023 | Surface Water Treatment Rule | Treatment Technique (SWTR and GWR) | Not reported | Resolved |
| January 1, 2023 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.150 MG/L
MCL 0.060 MG/L | Resolved |
| January 1, 2023 | Tthm | Maximum Contaminant Level Violation, Average | 0.220 MG/L
MCL 0.080 MG/L | Resolved |
| October 1, 2022 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.093 UG/L
MCL 0.060 UG/L | Resolved |
| October 1, 2022 | Tthm | Maximum Contaminant Level Violation, Average | 0.120 UG/L
MCL 0.080 UG/L | Resolved |
| July 1, 2022 | Tthm | Maximum Contaminant Level Violation, Average | 123 UG/L
MCL 0.080 UG/L | Resolved |
| July 1, 2022 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 93.30 UG/L
MCL 0.060 UG/L | Resolved |
| April 1, 2022 | Tthm | Maximum Contaminant Level Violation, Average | 140 UG/L
MCL 0.080 UG/L | Resolved |
| July 1, 2021 | Tthm | Maximum Contaminant Level Violation, Average | 160 UG/L
MCL 0.080 UG/L | Resolved |
| July 1, 2021 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 100 UG/L
MCL 0.060 UG/L | Resolved |
42 older violation s (5-10 years ago) · 42 health-based, 0 paperwork , all resolved
| Period start | Relates to | Item | Measured level | Status |
|---|---|---|---|---|
| April 1, 2021 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 71.50 UG/L
MCL 0.060 UG/L | Resolved |
| April 1, 2021 | Tthm | Maximum Contaminant Level Violation, Average | 100 UG/L
MCL 0.080 UG/L | Resolved |
| January 1, 2021 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 69 UG/L
MCL 0.060 UG/L | Resolved |
| January 1, 2021 | Tthm | Maximum Contaminant Level Violation, Average | 88 UG/L
MCL 0.080 UG/L | Resolved |
| October 1, 2020 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.075 MG/L
MCL 0.060 MG/L | Resolved |
| October 1, 2020 | Tthm | Maximum Contaminant Level Violation, Average | 0.092 MG/L
MCL 0.080 MG/L | Resolved |
| July 1, 2020 | Tthm | Maximum Contaminant Level Violation, Average | 90 UG/L
MCL 0.080 UG/L | Resolved |
| July 1, 2020 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 73 UG/L
MCL 0.060 UG/L | Resolved |
| April 1, 2020 | Tthm | Maximum Contaminant Level Violation, Average | 0.099 MG/L
MCL 0.080 MG/L | Resolved |
| April 1, 2020 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.087 MG/L
MCL 0.060 MG/L | Resolved |
| January 1, 2020 | Tthm | Maximum Contaminant Level Violation, Average | 0.125 MG/L
MCL 0.080 MG/L | Resolved |
| January 1, 2020 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.098 MG/L
MCL 0.060 MG/L | Resolved |
| October 1, 2019 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.118 MG/L
MCL 0.060 MG/L | Resolved |
| October 1, 2019 | Tthm | Maximum Contaminant Level Violation, Average | 0.122 MG/L
MCL 0.080 MG/L | Resolved |
| July 1, 2019 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.111 MG/L
MCL 0.060 MG/L | Resolved |
| July 1, 2019 | Tthm | Maximum Contaminant Level Violation, Average | 0.130 MG/L
MCL 0.080 MG/L | Resolved |
| April 1, 2019 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.098 MG/L
MCL 0.060 MG/L | Resolved |
| April 1, 2019 | Tthm | Maximum Contaminant Level Violation, Average | 0.120 MG/L
MCL 0.080 MG/L | Resolved |
| January 1, 2019 | Tthm | Maximum Contaminant Level Violation, Average | 0.130 MG/L
MCL 0.080 MG/L | Resolved |
| January 1, 2019 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.087 MG/L
MCL 0.060 MG/L | Resolved |
| October 1, 2018 | Tthm | Maximum Contaminant Level Violation, Average | 0.138 MG/L
MCL 0.080 MG/L | Resolved |
| October 1, 2018 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.099 MG/L
MCL 0.060 MG/L | Resolved |
| July 1, 2018 | Tthm | Maximum Contaminant Level Violation, Average | 0.140 UG/L
MCL 0.080 UG/L | Resolved |
| July 1, 2018 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.101 UG/L
MCL 0.060 UG/L | Resolved |
| April 1, 2018 | Tthm | Maximum Contaminant Level Violation, Average | 0.117 MG/L
MCL 0.080 MG/L | Resolved |
| April 1, 2018 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.095 MG/L
MCL 0.060 MG/L | Resolved |
| January 1, 2018 | Tthm | Maximum Contaminant Level Violation, Average | 118 UG/L
MCL 0.080 UG/L | Resolved |
| January 1, 2018 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 88 UG/L
MCL 0.060 UG/L | Resolved |
| January 1, 2018 | Carbon, Total | Treatment Technique Precursor Removal | — | Resolved |
| January 1, 2018 | Carbon, Total | Treatment Technique Precursor Removal | — | Resolved |
| October 1, 2017 | Carbon, Total | Treatment Technique Precursor Removal | — | Resolved |
| October 1, 2017 | Carbon, Total | Treatment Technique Precursor Removal | — | Resolved |
| October 1, 2017 | Tthm | Maximum Contaminant Level Violation, Average | 110 UG/L
MCL 0.080 UG/L | Resolved |
| October 1, 2017 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 110 UG/L
MCL 0.060 UG/L | Resolved |
| July 1, 2017 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 128 UG/L
MCL 0.060 UG/L | Resolved |
| July 1, 2017 | Tthm | Maximum Contaminant Level Violation, Average | 148 UG/L
MCL 0.080 UG/L | Resolved |
| April 1, 2017 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 115 UG/L
MCL 0.060 UG/L | Resolved |
| April 1, 2017 | Tthm | Maximum Contaminant Level Violation, Average | 142 UG/L
MCL 0.080 UG/L | Resolved |
| January 1, 2017 | Tthm | Maximum Contaminant Level Violation, Average | 0.140 MG/L
MCL 0.080 MG/L | Resolved |
| January 1, 2017 | Total Haloacetic Acids (Haa5) | Maximum Contaminant Level Violation, Average | 0.088 MG/L
MCL 0.060 MG/L | Resolved |
| October 1, 2016 | Tthm | Maximum Contaminant Level Violation, Average | 130 UG/L
MCL 0.080 UG/L | Resolved |
| July 1, 2016 | Tthm | Maximum Contaminant Level Violation, Average | 131 UG/L
MCL 0.080 UG/L | Resolved |
Data from EPA SDWIS (violation records) , last refreshed May 24, 2026.
Where to see every contaminant this utility tested for
EPA's bulk SDWIS dataset gives MyTapWater.us per-system measured values for lead and copper, plus violation records for everything else. To see every regulated contaminant this utility tested for in the past year (TTHMs, HAA5, nitrate, arsenic, fluoride, chromium, etc.) with measured values, read the utility's Consumer Confidence Report (CCR).
Every community water system is required by EPA to publish a CCR annually, by July 1, listing every contaminant they sampled, the measured value, the federal limit, and any health-based exceedances. Most utilities post the report online; some mail it with your bill.
How to find MADERA CO MD1-HIDDEN LAKE ESTATES's CCR:
- Search the web for "MADERA CO MD1-HIDDEN LAKE ESTATES consumer confidence report" . The PDF is usually on the utility's own website.
- Or call the utility directly. Their phone number is in the contact section below.
Other water systems in Madera County, CA
Compare nearby utilities by population served.
- CITY OF MADERA
67k served · MADERA
- CHOWCHILLA CITY WATER DEPT
14k served · CHOWCHILLA
- LUPINE BASS LAKE
12k served · Madera County
- MADERA VALLEY WATER COMPANY
6,494 served · Madera County
- RIVERSTONE/ROOTCREEK WATER DISTRICT
5,507 served · MADERA
Contact this utility
Public administrative contact information for this water system, as filed with the EPA. Use this to ask about your service line, request your home's lead status, or report a water quality issue.
- Administrator
- TOLER, PHIL
- Phone
- 559-675-7811
- Mailing address
- 200 WEST 4TH ST., THIRD FLOORMADERA, CA 93637
Where this page's data comes from
Bundle released 2026-Q2, regenerated May 24, 2026. Each section above also shows its own source date so you can tell at a glance how fresh that part of the page is.
- EPA SDWIS bulk download — last refreshed May 24, 2026 (system info, violations, lead and copper samples).
- Lead service line inventory — last refreshed May 24, 2026 (from the utility's reported inventory).
- CDC My Water's Fluoride — last refreshed May 19, 2026 (per-system Yes/No fluoridation status).
- CDC Water Fluoridation Reporting System — last refreshed May 16, 2026 (state and county fluoridation aggregates).
Every value on this page is cross-verified before publication; read our methodology for the verification steps and corrections process.