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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.

Cyanide results

MS0730010 , Lake Arrowhead

30 samples have been analysed for Cyanide 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 Cyanide result

The table below lists 1–10 of 30 samples, newest first — collected July 9, 2019 to December 16, 2025.

10 Cyanide results from the 10 samples listed here: 0 detected, 10 not detected.

Cyanide results for Lake Arrowhead, from 1 to 10 of 30 samples shown analysed for it, newest first. This view leaves out other analytes on the same samples. Not detected means the amount was below the level the laboratory can reliably report, which is given beside it.
Result Analyte Monitoring period
Collected
Dec 16, 2025 11:42
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
CN-251217-008
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Dec 16, 2025 11:42, sampling point TF103 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Dec 16, 2025 11:35
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
CN-251217-009
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Dec 16, 2025 11:35, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Dec 16, 2025 11:15
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
CN-251217-010
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Dec 16, 2025 11:15, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Oct 4, 2022 12:30
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
CN-221005-054
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Oct 4, 2022 12:30, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2020 – Dec 31, 2022
Collected
Oct 4, 2022 12:20
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
CN-221005-053
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Oct 4, 2022 12:20, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2020 – Dec 31, 2022
Collected
Oct 4, 2022 12:40
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
CN-221005-055
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Oct 4, 2022 12:40, sampling point TF103 Cyanide 1024 EPA method QC10204001X Jan 1, 2020 – Dec 31, 2022
Collected
Oct 23, 2019 14:15
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
191024-016CN
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Oct 23, 2019 14:15, sampling point TF103 Cyanide 1024 EPA method QC10204001X Jan 1, 2017 – Dec 31, 2019
Collected
Jul 9, 2019 09:55
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
190710-004CN
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Jul 9, 2019 09:55, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2017 – Dec 31, 2019
Collected
Jul 9, 2019 09:55
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
190710-003CN
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Jul 9, 2019 09:55, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2017 – Dec 31, 2019
Collected
Jul 9, 2019 09:40
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
190710-002CN
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Jul 9, 2019 09:40, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2017 – Dec 31, 2019

Routine (10).