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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

MS0170043 , Walls Water Assn- Lake Forest

30 of the 61 analytes this system has been tested for have been detected at least once, across 302 samples on record.

The other 31 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 302 samples on record, detections range from September 9, 1993 to July 28, 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 Assn- Lake Forest, 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 203 of 212 results Sep 9, 1993 Sep 26, 2024
Lead 1030 Inorganic Chemical 78 of 212 results Sep 9, 1993 Sep 26, 2024
TTHM 2950 Organic Chemical 13 of 13 results May 19, 2004 Jul 28, 2026
Barium 1010 Inorganic Chemical 11 of 11 results May 14, 2002 Feb 4, 2025
Fluoride 1025 Inorganic Chemical 10 of 11 results May 14, 2002 Feb 4, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 9 of 12 results Sep 18, 2008 Mar 18, 2024
Chloroform 2941 Organic Chemical 8 of 8 results Sep 18, 2008 Jul 28, 2026
Bromodichloromethane 2943 Organic Chemical 8 of 8 results Sep 18, 2008 Jul 28, 2026
Chromium 1020 Inorganic Chemical 7 of 11 results Jan 26, 2004 Feb 4, 2025
Dichloroacetic Acid 2451 Organic Chemical 5 of 7 results Sep 18, 2008 Aug 25, 2020
Gross Alpha, Incl. Radon & U 4002 Radionuclide 5 of 5 results Mar 7, 2012 Oct 4, 2012
Nitrate-Nitrite 1038 Inorganic Chemical 4 of 23 results Mar 21, 2016 Feb 2, 2021
Nitrate 1040 Inorganic Chemical 4 of 23 results Mar 21, 2016 Feb 2, 2021
Trichloroacetic Acid 2452 Organic Chemical 4 of 7 results Sep 18, 2008 Aug 25, 2020
Dibromochloromethane 2944 Organic Chemical 3 of 8 results Sep 18, 2008 Jul 28, 2026
Sodium 1052 Inorganic Chemical 3 of 3 results Sep 17, 2019 Oct 15, 2024
Nickel 1036 Inorganic Chemical 3 of 11 results Jan 25, 2006 Apr 14, 2014
Selenium 1045 Inorganic Chemical 3 of 11 results Jan 26, 2004 Jan 25, 2006
Gross Alpha, Excl. Radon & U 4000 Radionuclide 2 of 2 results Sep 23, 2009 Mar 15, 2010
Gross Beta Particle Activity 4100 Radionuclide 2 of 2 results Sep 23, 2009 Mar 15, 2010
Gross Alpha Particle Activity 4109 Radionuclide 2 of 2 results Sep 23, 2009 Mar 15, 2010
Cadmium 1015 Inorganic Chemical 2 of 11 results Mar 2, 2005 Jan 25, 2006
Sulfate 1055 Inorganic Chemical 2 of 2 results May 14, 2002 Jan 26, 2004
Cyanide 1024 Inorganic Chemical 1 of 10 results Aug 19, 2025 Aug 19, 2025
Nitrite 1041 Inorganic Chemical 1 of 23 results Jan 10, 2022 Jan 10, 2022
Monochloroacetic Acid 2450 Organic Chemical 1 of 7 results Jul 12, 2012 Jul 12, 2012
Monobromoacetic Acid 2453 Organic Chemical 1 of 7 results Jul 12, 2012 Jul 12, 2012
Combined Radium (-226 & -228) 4010 Radionuclide 1 of 7 results Sep 23, 2009 Sep 23, 2009
Radium-226 4020 Radionuclide 1 of 7 results Sep 23, 2009 Sep 23, 2009
Radium-228 4030 Radionuclide 1 of 7 results Sep 23, 2009 Sep 23, 2009

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 191–200 of 302 samples, newest first — collected September 11, 2007 to May 14, 2008. The summary above covers all 302.

48 results from the 10 samples listed here: 10 detected, 38 not detected. Across the whole record it is 398 of 909. 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 Assn- Lake Forest, every result from 191 to 200 of 302 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
May 14, 2008
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
080515-054NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected May 14, 2008, sampling point TF080 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 May 14, 2008, sampling point TF080 Nitrate 1040 EPA method 353.2 Jan 1, 2008 – Dec 31, 2008
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected May 14, 2008, sampling point TF080 Nitrite 1041 EPA method 353.2 Jan 1, 2008 – Dec 31, 2008
Collected
Apr 21, 2008
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
080422-019VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 Dichloromethane 2964 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 Benzene 2990 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 Toluene 2991 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 21, 2008, sampling point TF080 Styrene 2996 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Collected
Apr 16, 2008
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
080417-023IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 16, 2008, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
0.036002 mg/l , sample collected Apr 16, 2008, sampling point TF080 Barium 1010 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Apr 16, 2008, sampling point TF080 Cadmium 1015 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 16, 2008, sampling point TF080 Chromium 1020 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
0.12 mg/l , sample collected Apr 16, 2008, sampling point TF080 Fluoride 1025 EPA method 380-75WE Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0002 mg/l Minimum Reporting Level , sample collected Apr 16, 2008, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
0.003903 mg/l , sample collected Apr 16, 2008, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 16, 2008, sampling point TF080 Selenium 1045 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 16, 2008, sampling point TF080 Antimony, Total 1074 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Apr 16, 2008, sampling point TF080 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 16, 2008, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Collected
Apr 16, 2008
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
080417-020CN
Laboratory
MSDH Lab
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Apr 16, 2008, sampling point TF080 Cyanide 1024 EPA method QC10204001X Jan 1, 2008 – Dec 31, 2010
Collected
Sep 13, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070914-295PB
Laboratory
MSDH Lab
0.5241 mg/l , sample collected Sep 13, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.0005 mg/l , sample collected Sep 13, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Sep 13, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070914-281PB
Laboratory
MSDH Lab
0.3353 mg/l , sample collected Sep 13, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 13, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Sep 12, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070914-276PB
Laboratory
MSDH Lab
0.6413 mg/l , sample collected Sep 12, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 12, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Sep 11, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070914-301PB
Laboratory
MSDH Lab
0.4622 mg/l , sample collected Sep 11, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 11, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Sep 11, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070914-294PB
Laboratory
MSDH Lab
0.5944 mg/l , sample collected Sep 11, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 11, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Sep 11, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070914-293PB
Laboratory
MSDH Lab
0.1055 mg/l , sample collected Sep 11, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 11, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007

Routine (10).