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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 31–40 of 281 samples, newest first — collected July 6, 2022 to July 25, 2023. The summary above covers all 281.

19 results from the 10 samples listed here: 10 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.

We withheld the location of 6 sampling points below. The location on record identifies a private home, and we do not publish those. That is our decision, not the agency’s. The sampling point, its type and every result taken there are published unchanged.

Chemical and radiological sample results for Walls Water Association, every result from 31 to 40 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
Jul 25, 2023 09:00
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
HA-230726-026
Laboratory
MSDH Lab
1.63 ug/l , sample collected Jul 25, 2023 09:00, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Collected
Jul 25, 2023 08:50
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-230726-026
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 25, 2023 08:50, sampling point MRT000 TTHM 2950 EPA method 524.2 Not recorded
Collected
Jan 23, 2023 11:33
Sampling point
TF102 Treatment Plant 102
Sample type
Routine
Lab sample
NI-230124-016
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 23, 2023 11:33, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 23, 2023 11:33, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 23, 2023 11:33, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Collected
Jul 7, 2022 08:30
Sampling point
LC0007 Location withheld
Sample type
Routine
Lab sample
PB-220708-020
Laboratory
MSDH Lab
0.376 mg/l , sample collected Jul 7, 2022 08:30, sampling point LC0007 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 7, 2022 08:30, sampling point LC0007 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 7, 2022 05:00
Sampling point
LC0002 Location withheld
Sample type
Routine
Lab sample
PB-220708-017
Laboratory
MSDH Lab
0.0068 mg/l , sample collected Jul 7, 2022 05:00, sampling point LC0002 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 7, 2022 05:00, sampling point LC0002 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 7, 2022 05:55
Sampling point
LC0008 Location withheld
Sample type
Routine
Lab sample
PB-220708-015
Laboratory
MSDH Lab
0.0193 mg/l , sample collected Jul 7, 2022 05:55, sampling point LC0008 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 7, 2022 05:55, sampling point LC0008 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 7, 2022 08:00
Sampling point
LC0010 Location withheld
Sample type
Routine
Lab sample
PB-220708-014
Laboratory
MSDH Lab
0.0559 mg/l , sample collected Jul 7, 2022 08:00, sampling point LC0010 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
1.3 ug/l , sample collected Jul 7, 2022 08:00, sampling point LC0010 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 7, 2022 14:35
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220708-012
Laboratory
MSDH Lab
0.358 mg/l , sample collected Jul 7, 2022 14:35, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 7, 2022 14:35, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 7, 2022 11:00
Sampling point
LC0012 Location withheld
Sample type
Routine
Lab sample
PB-220708-011
Laboratory
MSDH Lab
0.187 mg/l , sample collected Jul 7, 2022 11:00, sampling point LC0012 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.5 ug/l , sample collected Jul 7, 2022 11:00, sampling point LC0012 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 6, 2022 14:04
Sampling point
LC0009 Location withheld
Sample type
Routine
Lab sample
PB-220708-019
Laboratory
MSDH Lab
0.19 mg/l , sample collected Jul 6, 2022 14:04, sampling point LC0009 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2022 14:04, sampling point LC0009 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022

Routine (10).