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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 141–150 of 302 samples, newest first — collected October 3, 2012 to June 18, 2013. The summary above covers all 302.

25 results from the 10 samples listed here: 10 detected, 15 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 141 to 150 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
Jun 18, 2013 05:45
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
130621-076PB
Laboratory
MSDH Lab
0.3594 mg/l , sample collected Jun 18, 2013 05:45, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jun 18, 2013 05:45, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Collected
Jun 18, 2013 05:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
130621-075PB
Laboratory
MSDH Lab
0.1847 mg/l , sample collected Jun 18, 2013 05:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jun 18, 2013 05:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Collected
Jun 18, 2013 06:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
130621-072PB
Laboratory
MSDH Lab
0.0278 mg/l , sample collected Jun 18, 2013 06:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jun 18, 2013 06:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Collected
Jun 18, 2013 07:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
130621-071PB
Laboratory
MSDH Lab
0.0442 mg/l , sample collected Jun 18, 2013 07:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jun 18, 2013 07:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Collected
Jun 18, 2013 05:10
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
130621-068PB
Laboratory
MSDH Lab
0.1046 mg/l , sample collected Jun 18, 2013 05:10, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jun 18, 2013 05:10, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Collected
Jun 17, 2013 10:45
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
130621-077PB
Laboratory
MSDH Lab
0.0606 mg/l , sample collected Jun 17, 2013 10:45, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
0.0005 mg/l , sample collected Jun 17, 2013 10:45, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Collected
Jun 17, 2013 08:10
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
130621-069PB
Laboratory
MSDH Lab
0.3437 mg/l , sample collected Jun 17, 2013 08:10, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jun 17, 2013 08:10, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Collected
Jan 23, 2013 01:00
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
130124-069NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 23, 2013 01:00, sampling point TF080 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 23, 2013 01:00, sampling point TF080 Nitrate 1040 EPA method 353.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 23, 2013 01:00, sampling point TF080 Nitrite 1041 EPA method 353.2 Jan 1, 2013 – Dec 31, 2013
Collected
Oct 4, 2012 13:00
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
201301120264
Laboratory
Radiation Safety Engineering
0.7 pci/l , sample collected Oct 4, 2012 13:00, sampling point TF080 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.21 pci/l Minimum Reporting Level , sample collected Oct 4, 2012 13:00, sampling point TF080 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.21 pci/l Minimum Reporting Level , sample collected Oct 4, 2012 13:00, sampling point TF080 Radium-226 4020 EPA method 903.1 Oct 1, 2012 – Dec 31, 2012
Not detected below 0.21 pci/l Minimum Reporting Level , sample collected Oct 4, 2012 13:00, sampling point TF080 Radium-228 4030 EPA method 904.0 Oct 1, 2012 – Dec 31, 2012
Collected
Oct 3, 2012 13:00
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
121004-117
Laboratory
Radiation Safety Engineering
0.7 pci/l , sample collected Oct 3, 2012 13:00, sampling point TF080 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.21 pci/l Minimum Reporting Level , sample collected Oct 3, 2012 13:00, sampling point TF080 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.21 pci/l Minimum Reporting Level , sample collected Oct 3, 2012 13:00, sampling point TF080 Radium-226 4020 EPA method 903.1 Oct 1, 2012 – Dec 31, 2012
Not detected below 0.21 pci/l Minimum Reporting Level , sample collected Oct 3, 2012 13:00, sampling point TF080 Radium-228 4030 EPA method 904.0 Oct 1, 2012 – Dec 31, 2012

Routine (10).