This is a rebuild of Drinking Water Watch and not yet the official record. Use the agency’s current Drinking Water Watch for anything you need to rely on.
Fluoride results
MS0730010 , Lake Arrowhead
29 samples have been analysed for Fluoride at Lake Arrowhead.
This is one analyte out of the system’s whole record. For what has ever been detected here, and when, see all chemical and radiological results; for everything the system is tested for, see the analyte list.
What counts as a non-detect is defined in the help: Less than Indicator. This system’s violations.
No date range is applied: this list draws on every sample on record. Show the last two years only.
Every Fluoride result
The table below lists 1–10 of 29 samples, newest first — collected December 13, 2016 to April 2, 2025.
10 Fluoride results from the 10 samples listed here: 7 detected, 3 not detected. Those samples also carried 97 results for other analytes, which are on the full results page.
| Result | Analyte | Monitoring period |
|---|---|---|
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| 0.258 mg/l , sample collected Apr 2, 2025 11:50, sampling point TF103 | Fluoride 1025 EPA method QC 10-109-12-2-A | Jan 1, 2023 – Dec 31, 2025 |
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| 0.321 mg/l , sample collected Apr 2, 2025 11:30, sampling point TF102 | Fluoride 1025 EPA method QC 10-109-12-2-A | Jan 1, 2023 – Dec 31, 2025 |
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| 0.275 mg/l , sample collected Apr 2, 2025 11:40, sampling point TF101 | Fluoride 1025 EPA method QC 10-109-12-2-A | Jan 1, 2023 – Dec 31, 2025 |
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| 0.247 mg/l , sample collected Dec 6, 2022 08:10, sampling point TF103 | Fluoride 1025 EPA method QC 10-109-12-2-A | Jan 1, 2020 – Dec 31, 2022 |
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| 0.274 mg/l , sample collected Dec 6, 2022 08:20, sampling point TF102 | Fluoride 1025 EPA method QC 10-109-12-2-A | Jan 1, 2020 – Dec 31, 2022 |
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| 0.245 mg/l , sample collected Dec 6, 2022 08:10, sampling point TF101 | Fluoride 1025 EPA method QC 10-109-12-2-A | Jan 1, 2020 – Dec 31, 2022 |
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| Not detected below 0.1 mg/l Minimum Reporting Level , sample collected May 14, 2019 14:30, sampling point TF103 | Fluoride 1025 EPA method 300.0 | Jan 1, 2017 – Dec 31, 2019 |
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| Not detected below 0.1 mg/l Minimum Reporting Level , sample collected May 14, 2019 14:10, sampling point TF102 | Fluoride 1025 EPA method 300.0 | Jan 1, 2017 – Dec 31, 2019 |
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| Not detected below 0.1 mg/l Minimum Reporting Level , sample collected May 14, 2019 14:00, sampling point TF101 | Fluoride 1025 EPA method 300.0 | Jan 1, 2017 – Dec 31, 2019 |
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| 0.395 mg/l , sample collected Dec 13, 2016 02:45, sampling point TF103 | Fluoride 1025 EPA method 300.0 | Jan 1, 2014 – Dec 31, 2016 |
-
- Collected
- Apr 2, 2025 11:50
- Sampling point
- TF103 Treatment Plant T103
- Sample type
- Routine
- Lab sample
- IN-250403-037
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2023 – Dec 31, 2025
-
Fluoride 1025 EPA method QC 10-109-12-2-A
- Result
- 0.258 mg/l
-
- Collected
- Apr 2, 2025 11:30
- Sampling point
- TF102 Treatment Plant T102
- Sample type
- Routine
- Lab sample
- IN-250403-036
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2023 – Dec 31, 2025
-
Fluoride 1025 EPA method QC 10-109-12-2-A
- Result
- 0.321 mg/l
-
- Collected
- Apr 2, 2025 11:40
- Sampling point
- TF101 Treatment Plant T101
- Sample type
- Routine
- Lab sample
- IN-250403-035
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2023 – Dec 31, 2025
-
Fluoride 1025 EPA method QC 10-109-12-2-A
- Result
- 0.275 mg/l
-
- Collected
- Dec 6, 2022 08:10
- Sampling point
- TF103 Treatment Plant T103
- Sample type
- Routine
- Lab sample
- IN-221207-072
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2020 – Dec 31, 2022
-
Fluoride 1025 EPA method QC 10-109-12-2-A
- Result
- 0.247 mg/l
-
- Collected
- Dec 6, 2022 08:20
- Sampling point
- TF102 Treatment Plant T102
- Sample type
- Routine
- Lab sample
- IN-221207-071
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2020 – Dec 31, 2022
-
Fluoride 1025 EPA method QC 10-109-12-2-A
- Result
- 0.274 mg/l
-
- Collected
- Dec 6, 2022 08:10
- Sampling point
- TF101 Treatment Plant T101
- Sample type
- Routine
- Lab sample
- IN-221207-070
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2020 – Dec 31, 2022
-
Fluoride 1025 EPA method QC 10-109-12-2-A
- Result
- 0.245 mg/l
-
- Collected
- May 14, 2019 14:30
- Sampling point
- TF103 Treatment Plant T103
- Sample type
- Routine
- Lab sample
- 190515-018IN
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2017 – Dec 31, 2019
-
Fluoride 1025 EPA method 300.0
- Result
- Not detected below 0.1 mg/l Minimum Reporting Level
-
- Collected
- May 14, 2019 14:10
- Sampling point
- TF102 Treatment Plant T102
- Sample type
- Routine
- Lab sample
- 190515-017IN
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2017 – Dec 31, 2019
-
Fluoride 1025 EPA method 300.0
- Result
- Not detected below 0.1 mg/l Minimum Reporting Level
-
- Collected
- May 14, 2019 14:00
- Sampling point
- TF101 Treatment Plant T101
- Sample type
- Routine
- Lab sample
- 190515-016IN
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2017 – Dec 31, 2019
-
Fluoride 1025 EPA method 300.0
- Result
- Not detected below 0.1 mg/l Minimum Reporting Level
-
- Collected
- Dec 13, 2016 02:45
- Sampling point
- TF103 Treatment Plant T103
- Sample type
- Routine
- Lab sample
- 161214-073IN
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2014 – Dec 31, 2016
-
Fluoride 1025 EPA method 300.0
- Result
- 0.395 mg/l
Routine (10).