The EPA's public water system record for Mission Water (System 084690532), serving Area 08, shows no detections of total microcystins, cylindrospermopsin, or anatoxin-a above their reporting levels in the 2018-2020 unregulated contaminant monitoring. This reflects a record with zero health-based violations related to algal toxins during that time.
Comparing Area 08's Record with Adjacent Counties
When considering how the algal toxin data for Area 08 stacks up against neighboring counties, it's important to focus on the same type of data—public system monitoring results for algal toxins. Adjacent counties may have detections or different monitoring frequencies. However, the absence of detections in Area 08's public system record does not guarantee the same for adjacent regions or for individual wells. Each area and water system can vary, and differences in water sources or monitoring approaches also affect results.
Interpreting the Measured Ranges Against Federal Standards
The EPA's 2018-2020 data for Mission Water shows all results below the analytical reporting levels: 0.3 µg/L for total microcystins, 0.09 µg/L for cylindrospermopsin, and 0.03 µg/L for anatoxin-a. Federal regulations do not establish maximum contaminant levels (MCLs) for these algal toxins. Instead, there are 10-day health advisories provided by the EPA. Therefore, no legal violations exist within this dataset, and the absence of detections indicates that algal toxins were not found above levels requiring immediate health advisories in this public water system during the monitored period.
Meaning of 'Detected', 'Median', and 'Range' in This Context
- Detected: A measurement above the reporting level during sampling. In this case, no results detected algal toxins above these thresholds.
- Median: The middle value of all measurements reported. With no detections, the median would be below the reporting limits.
- Range: The spread of detected concentrations. Here, the range is effectively below detection limits since no positive readings were recorded.
These metrics are summaries of sampling data for the entire public system, not measurements of any individual household tap or private well water.
How Aesthetic Secondary Standards Differ from Health-based Limits for Algal Toxins
It is important to understand that while some water quality standards address taste, color, or staining—often called aesthetic secondary standards—algal toxins are evaluated differently. The EPA's 10-day health advisories focus primarily on potential health risks from short-term exposure, rather than aesthetic qualities. Since the Mission Water system showed no algal toxins above reporting levels, aesthetic factors related to these toxins are not a concern here. This distinction helps clarify that aesthetic water issues do not necessarily indicate the presence or absence of algal toxins or health risks.
Sample Quantity, Well Coverage, and Limitations of Small Data Sets
The data for Mission Water reflect four sampling events conducted between June and September 2018. While this number provides a snapshot, it is not extensive. Small sample sizes can miss transient or localized occurrences of algal toxins, especially if fluctuations happen outside sampling periods or in certain distribution zones. This reinforces the importance of testing your own household water if you have concerns. Public system data are useful for broad understanding but cannot define conditions at an individual property's tap.
Closing Note on Treatment Options
For households in Area 08 evaluating technical approaches to address potential algal toxins, the Fleck Algal Toxins (Cyanotoxins) Filter ships ready to configure and is documented to reduce these contaminants effectively. Choosing treatment based on measured household water demand ensures adequate capacity tailored to your specific needs.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2018-09-12. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR4 monitoring (2018-2020) for Mission Water (084690532), 08: 12 results across 3 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
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