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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

MS0080001 , Black Hawk Water Assn #1

19 of the 57 analytes this system has been tested for have been detected at least once, across 251 samples on record.

The other 38 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 251 samples on record, detections range from January 11, 1994 to January 14, 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 Black Hawk Water Assn #1, 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 89 of 104 results Apr 26, 1994 Jul 24, 2023
Lead 1030 Inorganic Chemical 43 of 104 results Jan 11, 1994 Jul 24, 2023
Barium 1010 Inorganic Chemical 22 of 22 results Jul 25, 2002 Jan 14, 2025
Nitrate-Nitrite 1038 Inorganic Chemical 11 of 44 results Jun 14, 2006 Jan 14, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 10 of 10 results Dec 7, 2011 Jul 13, 2012
Chromium 1020 Inorganic Chemical 9 of 22 results Jul 25, 2002 Jan 14, 2025
Nitrite 1041 Inorganic Chemical 8 of 44 results Jun 14, 2006 Nov 6, 2018
Fluoride 1025 Inorganic Chemical 7 of 22 results Mar 2, 2005 Jan 14, 2025
Nitrate 1040 Inorganic Chemical 5 of 44 results May 7, 2008 Jan 14, 2025
TTHM 2950 Organic Chemical 4 of 17 results Jul 10, 2007 Aug 14, 2024
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 4 of 17 results Jul 10, 2007 Aug 13, 2014
Sodium 1052 Inorganic Chemical 3 of 3 results Jan 20, 2021 Oct 15, 2024
Chloroform 2941 Organic Chemical 3 of 13 results Sep 6, 2017 Aug 14, 2024
Nickel 1036 Inorganic Chemical 3 of 22 results Mar 12, 2008 Apr 23, 2014
Dichloroacetic Acid 2451 Organic Chemical 2 of 13 results Aug 13, 2014 Aug 13, 2014
Cadmium 1015 Inorganic Chemical 2 of 22 results Mar 2, 2005 Mar 2, 2005
Selenium 1045 Inorganic Chemical 2 of 22 results Mar 2, 2005 Mar 2, 2005
Sulfate 1055 Inorganic Chemical 2 of 4 results Sep 22, 2003 Jan 14, 2004
Trichloroacetic Acid 2452 Organic Chemical 1 of 13 results Aug 13, 2014 Aug 13, 2014

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 251 samples, newest first — collected June 29, 2011 to December 7, 2011. The summary above covers all 251.

30 results from the 10 samples listed here: 10 detected, 20 not detected. Across the whole record it is 230 of 1,104. 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 Black Hawk Water Assn #1, every result from 141 to 150 of 251 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
Dec 7, 2011 13:40
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
111208-050
Laboratory
Radiation Safety Engineering
0.6 pci/l , sample collected Dec 7, 2011 13:40, sampling point TF101 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.35 pci/l Minimum Reporting Level , sample collected Dec 7, 2011 13:40, sampling point TF101 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.242 pci/l Minimum Reporting Level , sample collected Dec 7, 2011 13:40, sampling point TF101 Radium-226 4020 EPA method 903.1 Oct 1, 2011 – Dec 31, 2011
Not detected below 0.35 pci/l Minimum Reporting Level , sample collected Dec 7, 2011 13:40, sampling point TF101 Radium-228 4030 EPA method 904.0 Oct 1, 2011 – Dec 31, 2011
Collected
Oct 19, 2011 02:00
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
111020-011NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Oct 19, 2011 02:00, sampling point TF102 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2011 – Dec 31, 2011
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Oct 19, 2011 02:00, sampling point TF102 Nitrate 1040 EPA method 353.2 Jan 1, 2011 – Dec 31, 2011
0.03 mg/l , sample collected Oct 19, 2011 02:00, sampling point TF102 Nitrite 1041 EPA method 353.2 Jan 1, 2011 – Dec 31, 2011
Collected
Jul 13, 2011 03:50
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
110714-012TH
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 13, 2011 03:50, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 13, 2011 03:50, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 13, 2011 03:50, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 13, 2011 03:50, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 4 ug/l Minimum Reporting Level , sample collected Jul 13, 2011 03:50, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2011 – Dec 31, 2013
Collected
Jul 13, 2011 03:50
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
110714-012HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Jul 13, 2011 03:50, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 13, 2011 03:50, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 13, 2011 03:50, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 13, 2011 03:50, 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 13, 2011 03:50, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 0.006 mg/l Minimum Reporting Level , sample collected Jul 13, 2011 03:50, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2011 – Dec 31, 2013
Collected
Jun 29, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110630-047PB
Laboratory
MSDH Lab
0.0111 mg/l , sample collected Jun 29, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
0.0007 mg/l , sample collected Jun 29, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Collected
Jun 29, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110630-046PB
Laboratory
MSDH Lab
0.0133 mg/l , sample collected Jun 29, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
0.001 mg/l , sample collected Jun 29, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Collected
Jun 29, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110630-045PB
Laboratory
MSDH Lab
0.0254 mg/l , sample collected Jun 29, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jun 29, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Collected
Jun 29, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110630-044PB
Laboratory
MSDH Lab
0.015 mg/l , sample collected Jun 29, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jun 29, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Collected
Jun 29, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110630-043PB
Laboratory
MSDH Lab
0.0254 mg/l , sample collected Jun 29, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jun 29, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Collected
Jun 29, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110630-042PB
Laboratory
MSDH Lab
0.0093 mg/l , sample collected Jun 29, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jun 29, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011

Routine (10).