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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

MS0260003 , Castalian W/A

10 of the 51 analytes this system has been tested for have been detected at least once, across 113 samples on record.

The other 41 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 113 samples on record, detections range from August 17, 1993 to September 10, 2025. 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 Castalian W/A, 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 66 of 84 results Aug 17, 1993 Sep 10, 2025
Lead 1030 Inorganic Chemical 36 of 84 results Aug 17, 1993 Sep 10, 2025
TTHM 2950 Organic Chemical 6 of 9 results Jun 4, 2007 Oct 17, 2022
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 4 of 9 results Jun 4, 2007 Oct 17, 2022
Chloroform 2941 Organic Chemical 3 of 6 results Jul 1, 2009 Aug 17, 2017
Dichloroacetic Acid 2451 Organic Chemical 2 of 5 results Jul 1, 2009 Jun 28, 2011
Barium 1010 Inorganic Chemical 2 of 2 results Sep 17, 2003 Feb 9, 2004
Sulfate 1055 Inorganic Chemical 2 of 2 results Sep 17, 2003 Feb 9, 2004
Monobromoacetic Acid 2453 Organic Chemical 1 of 5 results Jul 1, 2009 Jul 1, 2009
Fluoride 1025 Inorganic Chemical 1 of 2 results Sep 17, 2003 Sep 17, 2003

Showing samples collected between September 25, 2024 and September 25, 2026. That is this page’s default, not a limit on what the agency records.

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The most recent samples, result by result

The 7 samples collected between September 25, 2024 and September 25, 2026 are listed below, newest first.

12 results from the 7 samples listed here: 6 detected, 6 not detected. 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 6 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 Castalian W/A, every result from the 7 samples on record, 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
Sep 10, 2025 10:31
Sampling point
LC0012 Location withheld
Sample type
Routine
Lab sample
PB-250911-001
Laboratory
MSDH Lab
0.162 mg/l , sample collected Sep 10, 2025 10:31, sampling point LC0012 Copper, Free 1022 EPA method 200.8 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 10, 2025 10:31, sampling point LC0012 Lead 1030 EPA method 200.8 Jan 1, 2025 – Dec 31, 2025
Collected
Sep 10, 2025 12:00
Sampling point
LC0003 Location withheld
Sample type
Routine
Lab sample
PB-250911-003
Laboratory
MSDH Lab
0.0456 mg/l , sample collected Sep 10, 2025 12:00, sampling point LC0003 Copper, Free 1022 EPA method 200.8 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 10, 2025 12:00, sampling point LC0003 Lead 1030 EPA method 200.8 Jan 1, 2025 – Dec 31, 2025
Collected
Sep 10, 2025 12:35
Sampling point
LC0009 Location withheld
Sample type
Routine
Lab sample
PB-250911-002
Laboratory
MSDH Lab
0.148 mg/l , sample collected Sep 10, 2025 12:35, sampling point LC0009 Copper, Free 1022 EPA method 200.8 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 10, 2025 12:35, sampling point LC0009 Lead 1030 EPA method 200.8 Jan 1, 2025 – Dec 31, 2025
Collected
Sep 10, 2025 12:55
Sampling point
LC0011 Location withheld
Sample type
Routine
Lab sample
PB-250911-005
Laboratory
MSDH Lab
0.0576 mg/l , sample collected Sep 10, 2025 12:55, sampling point LC0011 Copper, Free 1022 EPA method 200.8 Jan 1, 2025 – Dec 31, 2025
0.5 ug/l , sample collected Sep 10, 2025 12:55, sampling point LC0011 Lead 1030 EPA method 200.8 Jan 1, 2025 – Dec 31, 2025
Collected
Sep 10, 2025 13:11
Sampling point
LC0015 Location withheld
Sample type
Routine
Lab sample
PB-250911-004
Laboratory
MSDH Lab
0.0791 mg/l , sample collected Sep 10, 2025 13:11, sampling point LC0015 Copper, Free 1022 EPA method 200.8 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 10, 2025 13:11, sampling point LC0015 Lead 1030 EPA method 200.8 Jan 1, 2025 – Dec 31, 2025
Collected
Apr 30, 2025 12:50
Sampling point
SMD Location withheld
Sample type
Routine
Lab sample
HA-250501-001
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Apr 30, 2025 12:50, sampling point SMD Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2025 – Dec 31, 2027
Collected
Apr 30, 2025 12:20
Sampling point
SMD Location withheld
Sample type
Routine
Lab sample
TH-250501-001
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Apr 30, 2025 12:20, sampling point SMD TTHM 2950 EPA method 524.2 Jan 1, 2025 – Dec 31, 2027

Routine (7).