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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

MS0700011 , Town of Walnut

22 of the 57 analytes this system has been tested for have been detected at least once, across 240 samples on record.

The other 35 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 240 samples on record, detections range from October 29, 2003 to July 16, 2026. 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 Town of Walnut, 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 93 of 93 results Aug 11, 2004 Aug 9, 2023
Lead 1030 Inorganic Chemical 49 of 93 results Aug 11, 2004 Aug 9, 2023
Barium 1010 Inorganic Chemical 20 of 20 results Oct 29, 2003 Mar 31, 2025
Fluoride 1025 Inorganic Chemical 20 of 20 results Oct 29, 2003 Mar 31, 2025
Nickel 1036 Inorganic Chemical 16 of 20 results Mar 31, 2004 Mar 31, 2025
Chromium 1020 Inorganic Chemical 13 of 20 results Oct 29, 2003 Mar 31, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 10 of 10 results Dec 8, 2011 Jul 13, 2012
TTHM 2950 Organic Chemical 6 of 17 results Dec 10, 2007 May 14, 2025
Sodium 1052 Inorganic Chemical 5 of 5 results Oct 6, 2019 Jul 16, 2026
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 5 of 18 results Jul 15, 2010 May 14, 2025
Chloroform 2941 Organic Chemical 4 of 13 results Feb 12, 2025 May 14, 2025
Bromodichloromethane 2943 Organic Chemical 4 of 13 results Feb 12, 2025 May 14, 2025
Sulfate 1055 Inorganic Chemical 4 of 4 results Oct 29, 2003 Mar 31, 2004
Dichloroacetic Acid 2451 Organic Chemical 3 of 13 results Oct 29, 2020 May 14, 2025
Nitrite 1041 Inorganic Chemical 3 of 43 results May 20, 2020 Apr 17, 2024
Trichloroacetic Acid 2452 Organic Chemical 2 of 13 results May 14, 2025 May 14, 2025
Dibromochloromethane 2944 Organic Chemical 2 of 13 results May 14, 2025 May 14, 2025
Vinyl Chloride 2976 Organic Chemical 2 of 14 results Sep 28, 2022 Sep 28, 2022
Cadmium 1015 Inorganic Chemical 2 of 20 results Apr 26, 2005 Apr 26, 2005
Selenium 1045 Inorganic Chemical 2 of 20 results Apr 26, 2005 Apr 26, 2005
Monobromoacetic Acid 2453 Organic Chemical 1 of 13 results Oct 29, 2020 Oct 29, 2020
Nitrate-Nitrite 1038 Inorganic Chemical 1 of 43 results May 20, 2020 May 20, 2020

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 161–170 of 240 samples, newest first — collected July 30, 2008 to September 25, 2008. The summary above covers all 240.

21 results from the 10 samples listed here: 17 detected, 4 not detected. Across the whole record it is 267 of 1,060. 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 Town of Walnut, every result from 161 to 170 of 240 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 25, 2008
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
080926-009PB
Laboratory
MSDH Lab
0.1209 mg/l , sample collected Sep 25, 2008, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
0.0031 mg/l , sample collected Sep 25, 2008, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
Collected
Sep 25, 2008
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
080926-008PB
Laboratory
MSDH Lab
0.1703 mg/l , sample collected Sep 25, 2008, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
0.0031 mg/l , sample collected Sep 25, 2008, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
Collected
Sep 25, 2008
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
080926-007PB
Laboratory
MSDH Lab
0.5581 mg/l , sample collected Sep 25, 2008, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
0.0005 mg/l , sample collected Sep 25, 2008, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
Collected
Sep 25, 2008
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
080926-001PB
Laboratory
MSDH Lab
0.0851 mg/l , sample collected Sep 25, 2008, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
0.0006 mg/l , sample collected Sep 25, 2008, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
Collected
Sep 25, 2008
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
080926-006PB
Laboratory
MSDH Lab
0.0086 mg/l , sample collected Sep 25, 2008, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
0.0014 mg/l , sample collected Sep 25, 2008, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
Collected
Sep 25, 2008
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
080926-005PB
Laboratory
MSDH Lab
0.0661 mg/l , sample collected Sep 25, 2008, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 25, 2008, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
Collected
Sep 25, 2008
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
080926-004PB
Laboratory
MSDH Lab
0.1578 mg/l , sample collected Sep 25, 2008, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
0.0007 mg/l , sample collected Sep 25, 2008, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
Collected
Sep 25, 2008
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
080926-003PB
Laboratory
MSDH Lab
0.1549 mg/l , sample collected Sep 25, 2008, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
0.004 mg/l , sample collected Sep 25, 2008, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
Collected
Sep 25, 2008
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
080926-002PB
Laboratory
MSDH Lab
0.0702 mg/l , sample collected Sep 25, 2008, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
0.0197 mg/l , sample collected Sep 25, 2008, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2008 – Dec 31, 2008
Collected
Jul 30, 2008
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
080731-057NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jul 30, 2008, sampling point TF102 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2008 – Dec 31, 2008
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jul 30, 2008, sampling point TF102 Nitrate 1040 EPA method 353.2 Jan 1, 2008 – Dec 31, 2008
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jul 30, 2008, sampling point TF102 Nitrite 1041 EPA method 353.2 Jan 1, 2008 – Dec 31, 2008

Routine (10).