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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

MS0620010 , Sebastopol Water Association

41 of the 75 analytes this system has been tested for have been detected at least once, across 567 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 567 samples on record, detections range from October 22, 2003 to July 16, 2026. These figures cover the whole record; the list of samples further down is narrowed.

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 Sebastopol Water Association, 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 162 of 162 results Jun 17, 2004 Jul 1, 2025
Lead 1030 Inorganic Chemical 106 of 162 results Jun 17, 2004 Jul 1, 2025
Barium 1010 Inorganic Chemical 59 of 59 results Oct 22, 2003 Jun 23, 2026
Chromium 1020 Inorganic Chemical 37 of 59 results Oct 22, 2003 Mar 24, 2025
Fluoride 1025 Inorganic Chemical 24 of 63 results Oct 22, 2003 Jul 15, 2026
Sodium 1052 Inorganic Chemical 23 of 23 results Nov 9, 2009 Jul 16, 2026
TTHM 2950 Organic Chemical 18 of 28 results Sep 13, 2007 Jun 23, 2026
Chloroform 2941 Organic Chemical 16 of 23 results Jul 8, 2010 Jun 23, 2026
Nickel 1036 Inorganic Chemical 15 of 58 results Apr 26, 2006 Mar 24, 2025
Dichloroacetic Acid 2451 Organic Chemical 13 of 23 results Jul 8, 2010 Jun 23, 2026
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 10 of 29 results Jul 8, 2010 Jun 23, 2026
Sulfate 1055 Inorganic Chemical 7 of 8 results Oct 22, 2003 May 25, 2017
Trichloroacetic Acid 2452 Organic Chemical 5 of 23 results Jul 8, 2010 Jun 23, 2026
Calcium 1016 Inorganic Chemical 4 of 4 results Nov 9, 2009 May 25, 2017
Manganese 1032 Inorganic Chemical 4 of 4 results Nov 9, 2009 May 25, 2017
Potassium 1042 Inorganic Chemical 4 of 4 results Nov 9, 2009 May 25, 2017
Residue, Total, Filterable 1057 Water Quality 4 of 4 results Nov 9, 2009 May 25, 2017
Alkalinity, Caco3 Stability 1067 Water Quality 4 of 4 results Nov 9, 2009 May 25, 2017
Hardness, Total (As Caco3) 1915 Water Quality 4 of 4 results Nov 9, 2009 May 25, 2017
Alkalinity, Total 1927 Water Quality 4 of 4 results Nov 9, 2009 May 25, 2017
Calculated Sodium NACA Water Quality 4 of 4 results Nov 9, 2009 May 25, 2017
Bromodichloromethane 2943 Organic Chemical 3 of 23 results Jul 8, 2010 Jun 23, 2026
Carbon Dioxide 1901 Water Quality 3 of 3 results Nov 9, 2009 Nov 9, 2009
Iron, Field Result FEFD Inorganic Chemical 3 of 3 results Nov 9, 2009 Nov 9, 2009
PH, Field Result PHFD Water Quality 3 of 3 results Nov 9, 2009 Nov 9, 2009
Dibromochloromethane 2944 Organic Chemical 2 of 23 results Jul 8, 2010 Jun 23, 2026
Nitrate-Nitrite 1038 Inorganic Chemical 2 of 141 results Jul 28, 2008 Mar 13, 2023
Nitrate 1040 Inorganic Chemical 2 of 141 results Jul 28, 2008 Mar 13, 2023
Chloride 1017 Inorganic Chemical 2 of 4 results Nov 9, 2009 May 25, 2017
Magnesium 1031 Inorganic Chemical 2 of 4 results Nov 9, 2009 May 25, 2017
Selenium 1045 Inorganic Chemical 2 of 59 results Oct 22, 2003 Feb 8, 2010
Cyanide 1024 Inorganic Chemical 1 of 58 results Aug 29, 2022 Aug 29, 2022
Monobromoacetic Acid 2453 Organic Chemical 1 of 23 results Oct 13, 2020 Oct 13, 2020
Iron 1028 Inorganic Chemical 1 of 4 results May 25, 2017 May 25, 2017
Color 1905 Water Quality 1 of 1 result May 25, 2017 May 25, 2017
Gross Alpha Particle Activity 4109 Radionuclide 1 of 1 result Mar 10, 2014 Mar 10, 2014
Gross Alpha, Incl. Radon & U 4002 Radionuclide 1 of 1 result Dec 2, 2013 Dec 2, 2013
Cadmium 1015 Inorganic Chemical 1 of 59 results Feb 8, 2010 Feb 8, 2010
PH 1925 Water Quality 1 of 1 result Nov 9, 2009 Nov 9, 2009
Nitrite 1041 Inorganic Chemical 1 of 141 results Jul 28, 2008 Jul 28, 2008
Mercury 1035 Inorganic Chemical 1 of 59 results Dec 19, 2005 Dec 19, 2005

Showing samples collected between September 26, 2024 and September 26, 2026. That is this page’s default, not a limit on what the agency records.

Show every sample on record

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The most recent samples, result by result

The table below lists 31–40 of 59 samples, newest first — collected July 1, 2025 to July 1, 2025. The summary above covers all 59.

20 results from the 10 samples listed here: 16 detected, 4 not detected. Across the whole record it is 561 of 2,779. A sample is analysed for many analytes at once, so one sample appears on as many rows as it had results.

We withheld the location of 10 sampling points below. The location on record identifies a private home, and we do not publish those. That is our decision, not the agency’s. The sampling point, its type and every result taken there are published unchanged.

Chemical and radiological sample results for Sebastopol Water Association, every result from 31 to 40 of 59 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
Jul 1, 2025 06:30
Sampling point
LC004 Location withheld
Sample type
Routine
Lab sample
PB-250702-025
Laboratory
MSDH Lab
0.227 mg/l , sample collected Jul 1, 2025 06:30, sampling point LC004 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
1.9 ug/l , sample collected Jul 1, 2025 06:30, sampling point LC004 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 1, 2025 07:00
Sampling point
LC001 Location withheld
Sample type
Routine
Lab sample
PB-250702-024
Laboratory
MSDH Lab
0.237 mg/l , sample collected Jul 1, 2025 07:00, sampling point LC001 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.7 ug/l , sample collected Jul 1, 2025 07:00, sampling point LC001 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 1, 2025 08:30
Sampling point
LC013 Location withheld
Sample type
Routine
Lab sample
PB-250702-023
Laboratory
MSDH Lab
0.0348 mg/l , sample collected Jul 1, 2025 08:30, sampling point LC013 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 1, 2025 08:30, sampling point LC013 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 1, 2025 07:30
Sampling point
LC012 Location withheld
Sample type
Routine
Lab sample
PB-250702-022
Laboratory
MSDH Lab
0.0284 mg/l , sample collected Jul 1, 2025 07:30, sampling point LC012 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
1.2 ug/l , sample collected Jul 1, 2025 07:30, sampling point LC012 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 1, 2025 07:00
Sampling point
LC002 Location withheld
Sample type
Routine
Lab sample
PB-250702-021
Laboratory
MSDH Lab
0.168 mg/l , sample collected Jul 1, 2025 07:00, sampling point LC002 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.5 ug/l , sample collected Jul 1, 2025 07:00, sampling point LC002 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 1, 2025 07:00
Sampling point
LC018 Location withheld
Sample type
Routine
Lab sample
PB-250702-040
Laboratory
MSDH Lab
0.0136 mg/l , sample collected Jul 1, 2025 07:00, sampling point LC018 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 1, 2025 07:00, sampling point LC018 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 1, 2025 09:35
Sampling point
LC003 Location withheld
Sample type
Routine
Lab sample
PB-250702-039
Laboratory
MSDH Lab
0.0228 mg/l , sample collected Jul 1, 2025 09:35, sampling point LC003 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 1, 2025 09:35, sampling point LC003 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 1, 2025 10:00
Sampling point
LC010 Location withheld
Sample type
Routine
Lab sample
PB-250702-038
Laboratory
MSDH Lab
0.061 mg/l , sample collected Jul 1, 2025 10:00, sampling point LC010 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
4.6 ug/l , sample collected Jul 1, 2025 10:00, sampling point LC010 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 1, 2025 05:05
Sampling point
LC014 Location withheld
Sample type
Routine
Lab sample
PB-250702-037
Laboratory
MSDH Lab
0.0087 mg/l , sample collected Jul 1, 2025 05:05, sampling point LC014 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 1, 2025 05:05, sampling point LC014 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 1, 2025 07:26
Sampling point
LC020 Location withheld
Sample type
Routine
Lab sample
PB-250702-036
Laboratory
MSDH Lab
0.25 mg/l , sample collected Jul 1, 2025 07:26, sampling point LC020 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.6 ug/l , sample collected Jul 1, 2025 07:26, sampling point LC020 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025

Routine (10).