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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

MS0690053 , Hidden Valley Light Assn

27 of the 61 analytes this system has been tested for have been detected at least once, across 123 samples on record.

The other 34 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 123 samples on record, detections range from June 15, 2011 to March 31, 2025. 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 Hidden Valley Light Assn, 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 55 of 55 results Jun 15, 2011 Aug 3, 2023
Lead 1030 Inorganic Chemical 48 of 55 results Jun 15, 2011 Aug 3, 2023
Barium 1010 Inorganic Chemical 5 of 5 results May 20, 2013 Mar 31, 2025
Mercury 1035 Inorganic Chemical 5 of 5 results May 20, 2013 Mar 31, 2025
Nickel 1036 Inorganic Chemical 5 of 5 results May 20, 2013 Mar 31, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 5 of 5 results Dec 12, 2011 Jul 17, 2012
Combined Radium (-226 & -228) 4010 Radionuclide 5 of 5 results Dec 12, 2011 Jul 17, 2012
Radium-226 4020 Radionuclide 5 of 5 results Dec 12, 2011 Jul 17, 2012
Chromium 1020 Inorganic Chemical 4 of 5 results May 20, 2013 Mar 31, 2025
Sodium 1052 Inorganic Chemical 3 of 3 results Sep 24, 2019 Nov 13, 2023
Fluoride 1025 Inorganic Chemical 2 of 6 results May 19, 2021 Mar 31, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 2 of 6 results Aug 8, 2011 Feb 26, 2025
TTHM 2950 Organic Chemical 2 of 6 results Aug 8, 2011 Feb 26, 2025
Nitrate-Nitrite 1038 Inorganic Chemical 1 of 15 results Oct 31, 2023 Oct 31, 2023
Nitrate 1040 Inorganic Chemical 1 of 15 results Oct 31, 2023 Oct 31, 2023
Calcium 1016 Inorganic Chemical 1 of 1 result May 19, 2021 May 19, 2021
Chloride 1017 Inorganic Chemical 1 of 1 result May 19, 2021 May 19, 2021
Sulfate 1055 Inorganic Chemical 1 of 1 result May 19, 2021 May 19, 2021
Conductivity @ 25 C Umhos/CM 1064 Water Quality 1 of 1 result May 19, 2021 May 19, 2021
Alkalinity, Total 1927 Water Quality 1 of 1 result May 19, 2021 May 19, 2021
Dichloroacetic Acid 2451 Organic Chemical 1 of 4 results Aug 8, 2011 Aug 8, 2011
Trichloroacetic Acid 2452 Organic Chemical 1 of 4 results Aug 8, 2011 Aug 8, 2011
Dibromoacetic Acid 2454 Organic Chemical 1 of 4 results Aug 8, 2011 Aug 8, 2011
Chloroform 2941 Organic Chemical 1 of 4 results Aug 8, 2011 Aug 8, 2011
Bromoform 2942 Organic Chemical 1 of 4 results Aug 8, 2011 Aug 8, 2011
Bromodichloromethane 2943 Organic Chemical 1 of 4 results Aug 8, 2011 Aug 8, 2011
Dibromochloromethane 2944 Organic Chemical 1 of 4 results Aug 8, 2011 Aug 8, 2011

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 71–80 of 123 samples, newest first — collected February 12, 2013 to May 14, 2014. The summary above covers all 123.

56 results from the 10 samples listed here: 9 detected, 47 not detected. Across the whole record it is 160 of 695. 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 Hidden Valley Light Assn, every result from 71 to 80 of 123 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, 2014 13:30
Sampling point
WL001 Well 001
Sample type
Routine
Lab sample
140515-049NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected May 14, 2014 13:30, sampling point WL001 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2014 – Dec 31, 2014
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected May 14, 2014 13:30, sampling point WL001 Nitrate 1040 EPA method QC10107041C Jan 1, 2014 – Dec 31, 2014
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected May 14, 2014 13:30, sampling point WL001 Nitrite 1041 EPA method QC10107041C Jan 1, 2014 – Dec 31, 2014
Collected
Sep 16, 2013 01:40
Sampling point
WL001 Well 001
Sample type
Routine
Lab sample
130917-007CN
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Sep 16, 2013 01:40, sampling point WL001 Cyanide 1024 EPA method QC10204001X Jan 1, 2011 – Dec 31, 2013
Collected
Jun 24, 2013 01:30
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
130625-001TH
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 24, 2013 01:30, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 24, 2013 01:30, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 24, 2013 01:30, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 24, 2013 01:30, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 4 ug/l Minimum Reporting Level , sample collected Jun 24, 2013 01:30, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Collected
Jun 24, 2013 01:30
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
130625-001HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Jun 24, 2013 01:30, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jun 24, 2013 01:30, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jun 24, 2013 01:30, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jun 24, 2013 01:30, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jun 24, 2013 01:30, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 0.006 mg/l Minimum Reporting Level , sample collected Jun 24, 2013 01:30, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2013 – Dec 31, 2013
Collected
Jun 10, 2013 02:15
Sampling point
WL001 Well 001
Sample type
Routine
Lab sample
130611-023VO
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 Dichloromethane 2964 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 Benzene 2990 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 Toluene 2991 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 10, 2013 02:15, sampling point WL001 Styrene 2996 EPA method 524.2 Jan 1, 2013 – Dec 31, 2013
Collected
May 20, 2013 01:30
Sampling point
WL001 Well 001
Sample type
Routine
Lab sample
130521-014IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 20, 2013 01:30, sampling point WL001 Arsenic 1005 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
0.0494 mg/l , sample collected May 20, 2013 01:30, sampling point WL001 Barium 1010 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 20, 2013 01:30, sampling point WL001 Cadmium 1015 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
0.0035 mg/l , sample collected May 20, 2013 01:30, sampling point WL001 Chromium 1020 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected May 20, 2013 01:30, sampling point WL001 Fluoride 1025 EPA method 300.0 Jan 1, 2011 – Dec 31, 2013
0.0014 mg/l , sample collected May 20, 2013 01:30, sampling point WL001 Mercury 1035 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
0.0035 mg/l , sample collected May 20, 2013 01:30, sampling point WL001 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected May 20, 2013 01:30, sampling point WL001 Selenium 1045 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 20, 2013 01:30, sampling point WL001 Antimony, Total 1074 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 20, 2013 01:30, sampling point WL001 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 20, 2013 01:30, sampling point WL001 Thallium, Total 1085 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Collected
May 8, 2013 01:30
Sampling point
WL001 Well 001
Sample type
Routine
Lab sample
130509-050NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected May 8, 2013 01:30, sampling point WL001 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2013 – Dec 31, 2013
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected May 8, 2013 01:30, sampling point WL001 Nitrate 1040 EPA method QC10107041C Jan 1, 2013 – Dec 31, 2013
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected May 8, 2013 01:30, sampling point WL001 Nitrite 1041 EPA method QC10107041C Jan 1, 2013 – Dec 31, 2013
Collected
Feb 12, 2013 07:00
Sampling point
DS000
Sample type
Routine
Lab sample
130214-032PB
Laboratory
MSDH Lab
0.234 mg/l , sample collected Feb 12, 2013 07:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2013 – Jun 30, 2013
0.012 mg/l , sample collected Feb 12, 2013 07:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2013 – Jun 30, 2013
Collected
Feb 12, 2013 06:45
Sampling point
DS000
Sample type
Routine
Lab sample
130214-026PB
Laboratory
MSDH Lab
0.3886 mg/l , sample collected Feb 12, 2013 06:45, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2013 – Jun 30, 2013
0.005 mg/l , sample collected Feb 12, 2013 06:45, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2013 – Jun 30, 2013
Collected
Feb 12, 2013 06:30
Sampling point
DS000
Sample type
Routine
Lab sample
130214-025PB
Laboratory
MSDH Lab
0.2403 mg/l , sample collected Feb 12, 2013 06:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2013 – Jun 30, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 12, 2013 06:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2013 – Jun 30, 2013

Routine (10).