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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 41–50 of 59 samples, newest first — collected April 8, 2025 to July 1, 2025. The summary above covers all 59.

25 results from the 10 samples listed here: 8 detected, 17 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 5 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 41 to 50 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 06:15
Sampling point
LC015 Location withheld
Sample type
Routine
Lab sample
PB-250702-035
Laboratory
MSDH Lab
0.0748 mg/l , sample collected Jul 1, 2025 06:15, sampling point LC015 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 06:15, sampling point LC015 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 1, 2025 08:45
Sampling point
LC021 Location withheld
Sample type
Routine
Lab sample
PB-250702-034
Laboratory
MSDH Lab
0.121 mg/l , sample collected Jul 1, 2025 08:45, sampling point LC021 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.9 ug/l , sample collected Jul 1, 2025 08:45, sampling point LC021 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 1, 2025 05:00
Sampling point
LC019 Location withheld
Sample type
Routine
Lab sample
PB-250702-033
Laboratory
MSDH Lab
0.0065 mg/l , sample collected Jul 1, 2025 05:00, sampling point LC019 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.9 ug/l , sample collected Jul 1, 2025 05:00, sampling point LC019 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 1, 2025 05:14
Sampling point
LC024 Location withheld
Sample type
Routine
Lab sample
PB-250702-032
Laboratory
MSDH Lab
0.0234 mg/l , sample collected Jul 1, 2025 05:14, sampling point LC024 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 05:14, sampling point LC024 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 1, 2025 08:00
Sampling point
LC023 Location withheld
Sample type
Routine
Lab sample
PB-250702-031
Laboratory
MSDH Lab
0.0657 mg/l , sample collected Jul 1, 2025 08:00, sampling point LC023 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.8 ug/l , sample collected Jul 1, 2025 08:00, sampling point LC023 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Apr 8, 2025 14:00
Sampling point
TF107 TF107
Sample type
Routine
Lab sample
NI-250409-033
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 14:00, sampling point TF107 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 14:00, sampling point TF107 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 14:00, sampling point TF107 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Apr 8, 2025 13:45
Sampling point
TF106 TF106
Sample type
Routine
Lab sample
NI-250409-037
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 13:45, sampling point TF106 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 13:45, sampling point TF106 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 13:45, sampling point TF106 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Apr 8, 2025 14:30
Sampling point
TF105 Treatment Plant T105
Sample type
Routine
Lab sample
NI-250409-038
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 14:30, sampling point TF105 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 14:30, sampling point TF105 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 14:30, sampling point TF105 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Apr 8, 2025 14:15
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
NI-250409-034
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 14:15, sampling point TF103 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 14:15, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 14:15, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Apr 8, 2025 13:30
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-250409-035
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 13:30, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 13:30, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 13:30, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025

Routine (10).