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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 101–110 of 281 samples, newest first — collected June 25, 2014 to March 21, 2016. The summary above covers all 281.

51 results from the 10 samples listed here: 9 detected, 42 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 101 to 110 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
Mar 21, 2016 13:15
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
160322-043NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 21, 2016 13:15, sampling point TF101 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 13:15, sampling point TF101 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 13:15, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Collected
Jun 24, 2015 01:43
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
150625-013VO
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 Dichloromethane 2964 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 Benzene 2990 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 Toluene 2991 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2015 01:43, sampling point TF101 Styrene 2996 EPA method 524.2 Jan 1, 2015 – Dec 31, 2015
Collected
Jan 28, 2015 13:36
Sampling point
TF102 Treatment Plant 102
Sample type
Routine
Lab sample
150129-069NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 28, 2015 13:36, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 28, 2015 13:36, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 28, 2015 13:36, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Collected
Jan 28, 2015 13:19
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
150129-068NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 28, 2015 13:19, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 28, 2015 13:19, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 28, 2015 13:19, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Collected
Aug 20, 2014 01:40
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
140821-038HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Aug 20, 2014 01:40, 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 20, 2014 01:40, 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 20, 2014 01:40, 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 20, 2014 01:40, 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 20, 2014 01:40, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 0.006 mg/l Minimum Reporting Level , sample collected Aug 20, 2014 01:40, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2014 – Dec 31, 2016
Collected
Aug 20, 2014 01:15
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
140821-037HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Aug 20, 2014 01:15, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.007 mg/l , sample collected Aug 20, 2014 01:15, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.004 mg/l , sample collected Aug 20, 2014 01:15, 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 20, 2014 01:15, 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 20, 2014 01:15, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.011 mg/l , sample collected Aug 20, 2014 01:15, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2014 – Dec 31, 2016
Collected
Aug 20, 2014 01:15
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
140821-036TH
Laboratory
MSDH Lab
9.41 ug/l , sample collected Aug 20, 2014 01:15, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 20, 2014 01:15, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
4.11 ug/l , sample collected Aug 20, 2014 01:15, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
2.18 ug/l , sample collected Aug 20, 2014 01:15, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
15.7 ug/l , sample collected Aug 20, 2014 01:15, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2014 – Dec 31, 2016
Collected
Jul 14, 2014 01:36
Sampling point
TF102 Treatment Plant 102
Sample type
Routine
Lab sample
140715-013CN
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Jul 14, 2014 01:36, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2014 – Dec 31, 2016
Collected
Jul 14, 2014 01:18
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
140715-012CN
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Jul 14, 2014 01:18, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2014 – Dec 31, 2016
Collected
Jun 25, 2014 09:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
140709-025PB
Laboratory
MSDH Lab
0.0457 mg/l , sample collected Jun 25, 2014 09:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
0.0012 mg/l , sample collected Jun 25, 2014 09:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014

Routine (10).