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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 241–250 of 281 samples, newest first — collected August 24, 2000 to January 26, 2004. The summary above covers all 281.

56 results from the 10 samples listed here: 12 detected, 44 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 241 to 250 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
Jan 26, 2004
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
040127-102IN
Laboratory
MSDH Lab
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jan 26, 2004, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.032 mg/l , sample collected Jan 26, 2004, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Jan 26, 2004, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jan 26, 2004, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
1.44 mg/l , sample collected Jan 26, 2004, sampling point TF101 Fluoride 1025 EPA method 300.0 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 26, 2004, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Jan 26, 2004, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jan 26, 2004, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
5.39 mg/l , sample collected Jan 26, 2004, sampling point TF101 Sulfate 1055 EPA method 300.0 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jan 26, 2004, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0003 mg/l Minimum Reporting Level , sample collected Jan 26, 2004, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 26, 2004, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Collected
Jan 26, 2004
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
040127-040CN
Laboratory
MSDH Lab
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected Jan 26, 2004, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2002 – Dec 31, 2004
Collected
Jan 14, 2004
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
040115-009VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 1,2,4-Trichlorobenzene 2378 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 Cis-1,2-Dichloroethylene 2380 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 Xylenes, Total 2955 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 Dichloromethane 2964 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 O-Dichlorobenzene 2968 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 P-Dichlorobenzene 2969 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 Vinyl Chloride 2976 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 1,1-Dichloroethylene 2977 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 Trans-1,2-Dichloroethylene 2979 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 1,2-Dichloroethane 2980 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 1,1,1-Trichloroethane 2981 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 Carbon Tetrachloride 2982 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 1,2-Dichloropropane 2983 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 Trichloroethylene 2984 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 1,1,2-Trichloroethane 2985 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 Tetrachloroethylene 2987 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 Chlorobenzene 2989 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 Benzene 2990 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 Toluene 2991 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 Ethylbenzene 2992 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 14, 2004, sampling point TF101 Styrene 2996 Jan 1, 2004 – Mar 31, 2004
Collected
May 14, 2002
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
020515-035IN
Laboratory
MSDH Lab
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected May 14, 2002, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.034 mg/l , sample collected May 14, 2002, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected May 14, 2002, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected May 14, 2002, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
1 mg/l , sample collected May 14, 2002, sampling point TF101 Fluoride 1025 EPA method 300.0 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 14, 2002, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected May 14, 2002, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected May 14, 2002, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
4.3 mg/l , sample collected May 14, 2002, sampling point TF101 Sulfate 1055 EPA method 300.0 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected May 14, 2002, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0003 mg/l Minimum Reporting Level , sample collected May 14, 2002, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 14, 2002, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Collected
May 7, 2002
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
020508-059CN
Laboratory
MSDH Lab
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected May 7, 2002, sampling point TF101 Cyanide 1024 EPA method 335.4 Jan 1, 2002 – Dec 31, 2004
Collected
Apr 2, 2002
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
Not recorded
Laboratory
STL Billerica
Not detected below 0.197 mfl Minimum Reporting Level , sample collected Apr 2, 2002, sampling point DS000 Asbestos 1094 Not recorded
Collected
Aug 24, 2000
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
000825-070L
Laboratory
MSDH Lab
0.012 mg/l , sample collected Aug 24, 2000, sampling point DS000 Copper, Free 1022 Not recorded
Not detected below 0.001 mg/l Method Detection Limit , sample collected Aug 24, 2000, sampling point DS000 Lead 1030 Not recorded
Collected
Aug 24, 2000
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
000825-069L
Laboratory
MSDH Lab
0.18 mg/l , sample collected Aug 24, 2000, sampling point DS000 Copper, Free 1022 Not recorded
0.001 mg/l , sample collected Aug 24, 2000, sampling point DS000 Lead 1030 Not recorded
Collected
Aug 24, 2000
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
000825-068L
Laboratory
MSDH Lab
0.544 mg/l , sample collected Aug 24, 2000, sampling point DS000 Copper, Free 1022 Not recorded
0.001 mg/l , sample collected Aug 24, 2000, sampling point DS000 Lead 1030 Not recorded
Collected
Aug 24, 2000
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
000825-067L
Laboratory
MSDH Lab
0.308 mg/l , sample collected Aug 24, 2000, sampling point DS000 Copper, Free 1022 Not recorded
Not detected below 0.001 mg/l Method Detection Limit , sample collected Aug 24, 2000, sampling point DS000 Lead 1030 Not recorded

Routine (10).