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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.

Chemical and radiological sample results

MS0710011 , Walker Switch Water Assn

10 of the 13 analytes this system has been tested for have been detected at least once, across 91 samples on record.

The other 3 were tested for and never found. An analyte is counted here if any result on record measured it, so this covers the whole history and not the samples listed below.

Across all 91 samples on record, detections range from August 23, 2004 to September 16, 2025. These figures cover the whole record.

What counts as a non-detect is defined in the help: Less than Indicator. This system’s violations.

What has been detected, ever

Every analyte measured above its reporting level at any point in this system’s record, most often detected first. This is not limited to the samples listed below.

Every analyte ever detected for Walker Switch Water Assn, with how many results found it and when it was first and last detected. Covers the whole record, not only the samples listed below.
Analyte Kind Detected in First detected Last detected
Copper, Free 1022 Inorganic Chemical 63 of 63 results Aug 14, 2007 Aug 8, 2023
Lead 1030 Inorganic Chemical 25 of 63 results Aug 14, 2007 Sep 3, 2020
TTHM 2950 Organic Chemical 14 of 18 results Aug 23, 2004 Sep 16, 2025
Chloroform 2941 Organic Chemical 10 of 13 results Sep 23, 2009 Sep 16, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 6 of 19 results Sep 23, 2009 Aug 29, 2023
Bromodichloromethane 2943 Organic Chemical 4 of 13 results May 21, 2024 Sep 16, 2025
Dibromochloromethane 2944 Organic Chemical 2 of 13 results Aug 8, 2024 Aug 8, 2024
Dichloroacetic Acid 2451 Organic Chemical 2 of 14 results Sep 23, 2009 Jul 21, 2014
Monobromoacetic Acid 2453 Organic Chemical 1 of 14 results Oct 27, 2020 Oct 27, 2020
Monochloroacetic Acid 2450 Organic Chemical 1 of 14 results Aug 24, 2017 Aug 24, 2017

No date range is applied: this list draws on every sample on record. Show the last two years only.

The most recent samples, result by result

The table below lists 31–40 of 91 samples, newest first — collected August 24, 2017 to September 3, 2020. The summary above covers all 91.

27 results from the 10 samples listed here: 13 detected, 14 not detected. Across the whole record it is 128 of 285. A sample is analysed for many analytes at once, so one sample appears on as many rows as it had results.

Chemical and radiological sample results for Walker Switch Water Assn, every result from 31 to 40 of 91 samples shown, newest first. Not detected means the amount was below the level the laboratory can reliably report, which is given beside it.
Result Analyte Monitoring period
Collected
Sep 3, 2020 05:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
200904-106PB
Laboratory
MSDH Lab
0.0221 mg/l , sample collected Sep 3, 2020 05:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 3, 2020 05:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
Collected
Sep 3, 2020 06:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
200904-105PB
Laboratory
MSDH Lab
0.0209 mg/l , sample collected Sep 3, 2020 06:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
0.0037 mg/l , sample collected Sep 3, 2020 06:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
Collected
Sep 3, 2020 06:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
200904-103PB
Laboratory
MSDH Lab
0.0665 mg/l , sample collected Sep 3, 2020 06:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 3, 2020 06:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
Collected
Sep 3, 2020 07:45
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
200904-102PB
Laboratory
MSDH Lab
0.02 mg/l , sample collected Sep 3, 2020 07:45, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 3, 2020 07:45, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
Collected
Sep 3, 2020 07:07
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
200904-101PB
Laboratory
MSDH Lab
0.1328 mg/l , sample collected Sep 3, 2020 07:07, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 3, 2020 07:07, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
Collected
Sep 3, 2020 05:05
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
200904-100PB
Laboratory
MSDH Lab
0.0531 mg/l , sample collected Sep 3, 2020 05:05, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 3, 2020 05:05, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
Collected
Sep 3, 2020 06:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
200904-099PB
Laboratory
MSDH Lab
0.0049 mg/l , sample collected Sep 3, 2020 06:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 3, 2020 06:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
Collected
Sep 3, 2020 08:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
200904-098PB
Laboratory
MSDH Lab
0.1127 mg/l , sample collected Sep 3, 2020 08:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 3, 2020 08:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2018 – Dec 31, 2020
Collected
Aug 24, 2017 15:15
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
170825-005HA
Laboratory
MSDH Lab
0.006 mg/l , sample collected Aug 24, 2017 15:15, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 24, 2017 15:15, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 24, 2017 15:15, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 24, 2017 15:15, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 24, 2017 15:15, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.006 mg/l , sample collected Aug 24, 2017 15:15, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2016 – Dec 31, 2018
Collected
Aug 24, 2017 15:15
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
170825-007TH
Laboratory
MSDH Lab
2.3 ug/l , sample collected Aug 24, 2017 15:15, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 24, 2017 15:15, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 24, 2017 15:15, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 24, 2017 15:15, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
2.3 ug/l , sample collected Aug 24, 2017 15:15, sampling point MRT000 TTHM 2950 Jan 1, 2016 – Dec 31, 2018

Routine (10).