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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

MS0170019 , Walls Water Association

22 of the 58 analytes this system has been tested for have been detected at least once, across 281 samples on record.

The other 36 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 281 samples on record, detections range from September 9, 1993 to June 22, 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 Walls Water Association, 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 100 of 110 results Sep 9, 1993 Sep 23, 2025
Lead 1030 Inorganic Chemical 47 of 110 results Sep 9, 1993 Sep 23, 2025
TTHM 2950 Organic Chemical 20 of 22 results May 19, 2004 Jan 22, 2026
Barium 1010 Inorganic Chemical 16 of 16 results May 14, 2002 Feb 4, 2025
Fluoride 1025 Inorganic Chemical 14 of 17 results May 14, 2002 Jun 22, 2026
Chloroform 2941 Organic Chemical 14 of 16 results Jul 11, 2007 Jan 22, 2026
Bromodichloromethane 2943 Organic Chemical 14 of 16 results Jul 11, 2007 Jan 22, 2026
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 13 of 23 results Jul 11, 2007 Feb 24, 2025
Dibromochloromethane 2944 Organic Chemical 9 of 16 results Jul 11, 2007 Jan 22, 2026
Chromium 1020 Inorganic Chemical 8 of 16 results Mar 2, 2005 Feb 4, 2025
Dichloroacetic Acid 2451 Organic Chemical 6 of 16 results Jul 12, 2012 Feb 15, 2024
Trichloroacetic Acid 2452 Organic Chemical 6 of 16 results Jul 12, 2012 Feb 15, 2024
Nickel 1036 Inorganic Chemical 6 of 16 results Jan 25, 2006 Apr 14, 2014
Gross Alpha, Incl. Radon & U 4002 Radionuclide 5 of 10 results Mar 7, 2012 Oct 4, 2012
Xylenes, Total 2955 Organic Chemical 5 of 44 results Oct 12, 2004 Jul 29, 2008
Sodium 1052 Inorganic Chemical 3 of 3 results Sep 17, 2019 Oct 15, 2024
Selenium 1045 Inorganic Chemical 3 of 16 results Mar 2, 2005 Nov 5, 2008
Cadmium 1015 Inorganic Chemical 2 of 16 results Mar 2, 2005 Jan 25, 2006
Sulfate 1055 Inorganic Chemical 2 of 2 results May 14, 2002 Jan 26, 2004
Nitrite 1041 Inorganic Chemical 1 of 35 results Jan 10, 2022 Jan 10, 2022
Monobromoacetic Acid 2453 Organic Chemical 1 of 16 results Jul 24, 2018 Jul 24, 2018
Arsenic 1005 Inorganic Chemical 1 of 16 results Jan 25, 2006 Jan 25, 2006

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 91–100 of 281 samples, newest first — collected March 21, 2016 to September 22, 2016. The summary above covers all 281.

21 results from the 10 samples listed here: 12 detected, 9 not detected. Across the whole record it is 296 of 1,687. 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 Walls Water Association, every result from 91 to 100 of 281 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 22, 2016 08:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
160923-096PB
Laboratory
MSDH Lab
0.0303 mg/l , sample collected Sep 22, 2016 08:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 22, 2016 08:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Collected
Sep 22, 2016 05:45
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
160923-093PB
Laboratory
MSDH Lab
0.0208 mg/l , sample collected Sep 22, 2016 05:45, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 22, 2016 05:45, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Collected
Sep 21, 2016 04:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
160923-104PB
Laboratory
MSDH Lab
0.045 mg/l , sample collected Sep 21, 2016 04:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
0.0007 mg/l , sample collected Sep 21, 2016 04:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Collected
Sep 21, 2016 21:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
160923-097PB
Laboratory
MSDH Lab
0.0442 mg/l , sample collected Sep 21, 2016 21:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
0.0015 mg/l , sample collected Sep 21, 2016 21:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Collected
Sep 20, 2016 06:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
160923-102PB
Laboratory
MSDH Lab
0.0542 mg/l , sample collected Sep 20, 2016 06:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
0.0006 mg/l , sample collected Sep 20, 2016 06:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Collected
Sep 20, 2016 07:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
160923-100PB
Laboratory
MSDH Lab
0.0336 mg/l , sample collected Sep 20, 2016 07:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 20, 2016 07:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Collected
Sep 20, 2016 06:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
160923-099PB
Laboratory
MSDH Lab
0.0555 mg/l , sample collected Sep 20, 2016 06:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 20, 2016 06:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Collected
Sep 20, 2016 05:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
160923-095PB
Laboratory
MSDH Lab
0.0135 mg/l , sample collected Sep 20, 2016 05:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 20, 2016 05:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Collected
Sep 20, 2016 04:39
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
160923-094PB
Laboratory
MSDH Lab
0.0277 mg/l , sample collected Sep 20, 2016 04:39, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 20, 2016 04:39, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Collected
Mar 21, 2016 13:05
Sampling point
TF102 Treatment Plant 102
Sample type
Routine
Lab sample
160322-044NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 21, 2016 13:05, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 21, 2016 13:05, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 21, 2016 13:05, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016

Routine (10).