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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.

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

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 11–20 of 113 samples, newest first — collected June 13, 2022 to August 28, 2024. The summary above covers all 113.

18 results from the 10 samples listed here: 10 detected, 8 not detected. Across the whole record it is 123 of 350. 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 7 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 11 to 20 of 113 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
Aug 28, 2024 13:00
Sampling point
LC0016 Location withheld
Sample type
Routine
Lab sample
PB-240829-414
Laboratory
MSDH Lab
0.124 mg/l , sample collected Aug 28, 2024 13:00, sampling point LC0016 Copper, Free 1022 EPA method 200.8 Jan 1, 2024 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 28, 2024 13:00, sampling point LC0016 Lead 1030 EPA method 200.8 Jan 1, 2024 – Dec 31, 2024
Collected
Aug 27, 2024 13:30
Sampling point
LC0009 Location withheld
Sample type
Routine
Lab sample
PB-240829-418
Laboratory
MSDH Lab
0.0849 mg/l , sample collected Aug 27, 2024 13:30, sampling point LC0009 Copper, Free 1022 EPA method 200.8 Jan 1, 2024 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 27, 2024 13:30, sampling point LC0009 Lead 1030 EPA method 200.8 Jan 1, 2024 – Dec 31, 2024
Collected
Jun 14, 2023 17:15
Sampling point
LC0013 Location withheld
Sample type
Routine
Lab sample
PB-230615-095
Laboratory
MSDH Lab
0.132 mg/l , sample collected Jun 14, 2023 17:15, sampling point LC0013 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 14, 2023 17:15, sampling point LC0013 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Collected
Jun 13, 2023 15:40
Sampling point
LC0017 Location withheld
Sample type
Routine
Lab sample
PB-230615-099
Laboratory
MSDH Lab
0.0166 mg/l , sample collected Jun 13, 2023 15:40, sampling point LC0017 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 13, 2023 15:40, sampling point LC0017 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Collected
Jun 13, 2023 15:50
Sampling point
LC0014 Location withheld
Sample type
Routine
Lab sample
PB-230615-098
Laboratory
MSDH Lab
0.0708 mg/l , sample collected Jun 13, 2023 15:50, sampling point LC0014 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 13, 2023 15:50, sampling point LC0014 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Collected
Jun 13, 2023 16:10
Sampling point
LC0010 Location withheld
Sample type
Routine
Lab sample
PB-230615-097
Laboratory
MSDH Lab
0.0181 mg/l , sample collected Jun 13, 2023 16:10, sampling point LC0010 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 13, 2023 16:10, sampling point LC0010 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Collected
Jun 13, 2023 15:30
Sampling point
LC0009 Location withheld
Sample type
Routine
Lab sample
PB-230615-096
Laboratory
MSDH Lab
0.0165 mg/l , sample collected Jun 13, 2023 15:30, sampling point LC0009 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 13, 2023 15:30, sampling point LC0009 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Collected
Oct 17, 2022 12:40
Sampling point
SMD Location withheld
Sample type
Routine
Lab sample
HA-221018-026
Laboratory
MSDH Lab
1.83 ug/l , sample collected Oct 17, 2022 12:40, sampling point SMD Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2022 – Dec 31, 2024
Collected
Oct 17, 2022 12:40
Sampling point
SMD Location withheld
Sample type
Routine
Lab sample
TH-221018-026
Laboratory
MSDH Lab
4.16 ug/l , sample collected Oct 17, 2022 12:40, sampling point SMD TTHM 2950 EPA method 524.2 Jan 1, 2022 – Dec 31, 2024
Collected
Jun 13, 2022 18:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220615-095
Laboratory
MSDH Lab
0.088 mg/l , sample collected Jun 13, 2022 18:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 13, 2022 18:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2022

Routine (10).