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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 151–160 of 302 samples, newest first — collected January 23, 2012 to August 2, 2012. The summary above covers all 302.

50 results from the 10 samples listed here: 11 detected, 39 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 151 to 160 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
Aug 2, 2012 13:00
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120803-079
Laboratory
Radiation Safety Engineering
0.7 pci/l , sample collected Aug 2, 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 Aug 2, 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 Aug 2, 2012 13:00, sampling point TF080 Radium-226 4020 EPA method 903.1 Jul 1, 2012 – Sep 30, 2012
Not detected below 0.21 pci/l Minimum Reporting Level , sample collected Aug 2, 2012 13:00, sampling point TF080 Radium-228 4030 EPA method 904.0 Jul 1, 2012 – Sep 30, 2012
Collected
Aug 2, 2012 13:00
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120803-079RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 2, 2012 13:00, sampling point TF080 Combined Uranium 4006 EPA method 200.8 Jul 1, 2012 – Sep 30, 2012
Collected
Jul 17, 2012 01:40
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120718-018VO
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 Dichloromethane 2964 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 Benzene 2990 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 Toluene 2991 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2012 01:40, sampling point TF080 Styrene 2996 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Collected
Jul 12, 2012 01:05
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
120713-006TH
Laboratory
MSDH Lab
4.28 ug/l , sample collected Jul 12, 2012 01:05, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 12, 2012 01:05, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
1.63 ug/l , sample collected Jul 12, 2012 01:05, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 12, 2012 01:05, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
5.91 ug/l , sample collected Jul 12, 2012 01:05, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2011 – Dec 31, 2013
Collected
Jul 12, 2012 01:05
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
120713-005HA
Laboratory
MSDH Lab
0.005 mg/l , sample collected Jul 12, 2012 01:05, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.003 mg/l , sample collected Jul 12, 2012 01:05, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.002 mg/l , sample collected Jul 12, 2012 01:05, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
0.009 mg/l , sample collected Jul 12, 2012 01:05, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 12, 2012 01:05, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.019 mg/l , sample collected Jul 12, 2012 01:05, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2011 – Dec 31, 2013
Collected
May 21, 2012 13:15
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120522-136
Laboratory
Radiation Safety Engineering
0.7 pci/l , sample collected May 21, 2012 13:15, 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 May 21, 2012 13:15, sampling point TF080 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.21 pci/l Minimum Reporting Level , sample collected May 21, 2012 13:15, sampling point TF080 Radium-226 4020 EPA method 903.1 Apr 1, 2012 – Jun 30, 2012
Not detected below 0.21 pci/l Minimum Reporting Level , sample collected May 21, 2012 13:15, sampling point TF080 Radium-228 4030 EPA method 904.0 Apr 1, 2012 – Jun 30, 2012
Collected
May 21, 2012 13:15
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120522-136RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 21, 2012 13:15, sampling point TF080 Combined Uranium 4006 EPA method 200.8 Apr 1, 2012 – Jun 30, 2012
Collected
Mar 7, 2012 13:00
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120308-102
Laboratory
Radiation Safety Engineering
0.7 pci/l , sample collected Mar 7, 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 Mar 7, 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 Mar 7, 2012 13:00, sampling point TF080 Radium-226 4020 EPA method 903.1 Jan 1, 2012 – Mar 31, 2012
Not detected below 0.21 pci/l Minimum Reporting Level , sample collected Mar 7, 2012 13:00, sampling point TF080 Radium-228 4030 EPA method 904.0 Jan 1, 2012 – Mar 31, 2012
Collected
Mar 7, 2012 13:00
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120308-102RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 7, 2012 13:00, sampling point TF080 Combined Uranium 4006 EPA method 200.8 Jan 1, 2012 – Mar 31, 2012
Collected
Jan 23, 2012 12:59
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120124-086NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 23, 2012 12:59, sampling point TF080 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 23, 2012 12:59, sampling point TF080 Nitrate 1040 EPA method 353.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 23, 2012 12:59, sampling point TF080 Nitrite 1041 EPA method 353.2 Jan 1, 2012 – Dec 31, 2012

Routine (10).