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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 21–30 of 113 samples, newest first — collected August 17, 2017 to June 13, 2022. The summary above covers all 113.

24 results from the 10 samples listed here: 12 detected, 12 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.

Units in this table

Lead is recorded on this page in ug/l and mg/l. 1 mg/l = 1,000 ug/l.

Chemical and radiological sample results for Castalian W/A, every result from 21 to 30 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
Jun 13, 2022 17:45
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220615-093
Laboratory
MSDH Lab
0.071 mg/l , sample collected Jun 13, 2022 17:45, 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 17:45, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2022
Collected
Jun 13, 2022 18:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220615-092
Laboratory
MSDH Lab
0.0457 mg/l , sample collected Jun 13, 2022 18:00, 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 18:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2022
Collected
Jun 13, 2022 06:10
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220615-091
Laboratory
MSDH Lab
0.0596 mg/l , sample collected Jun 13, 2022 06:10, 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 06:10, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2022
Collected
Jun 13, 2022 17:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220615-094
Laboratory
MSDH Lab
0.0275 mg/l , sample collected Jun 13, 2022 17:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2022
0.8 ug/l , sample collected Jun 13, 2022 17:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2022
Collected
Jul 18, 2018 08:20
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
180719-118PB
Laboratory
MSDH Lab
0.3694 mg/l , sample collected Jul 18, 2018 08:20, sampling point DS000 Copper, Free 1022 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 18, 2018 08:20, sampling point DS000 Lead 1030 EPA method 200.8 Not recorded
Collected
Jul 18, 2018 09:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
180719-117PB
Laboratory
MSDH Lab
0.0775 mg/l , sample collected Jul 18, 2018 09:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 18, 2018 09:00, sampling point DS000 Lead 1030 EPA method 200.8 Not recorded
Collected
Jul 18, 2018 08:45
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
180719-116PB
Laboratory
MSDH Lab
0.0794 mg/l , sample collected Jul 18, 2018 08:45, sampling point DS000 Copper, Free 1022 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 18, 2018 08:45, sampling point DS000 Lead 1030 EPA method 200.8 Not recorded
Collected
Jul 18, 2018 08:10
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
180719-115PB
Laboratory
MSDH Lab
0.1057 mg/l , sample collected Jul 18, 2018 08:10, sampling point DS000 Copper, Free 1022 EPA method 200.8 Not recorded
0.0023 mg/l , sample collected Jul 18, 2018 08:10, sampling point DS000 Lead 1030 EPA method 200.8 Not recorded
Collected
Jul 18, 2018 09:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
180719-114PB
Laboratory
MSDH Lab
0.1755 mg/l , sample collected Jul 18, 2018 09:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Not recorded
0.0011 mg/l , sample collected Jul 18, 2018 09:30, sampling point DS000 Lead 1030 EPA method 200.8 Not recorded
Collected
Aug 17, 2017 14:15
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
170818-001HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Aug 17, 2017 14:15, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 17, 2017 14:15, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 17, 2017 14:15, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 17, 2017 14:15, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 17, 2017 14:15, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 0.006 mg/l Minimum Reporting Level , sample collected Aug 17, 2017 14:15, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2016 – Dec 31, 2018

Routine (10).