Anuual Groundwater Reporting

Municipal wastewater contains numerous dissolved inorganic waste constituents which are forms of salinity that may pass through the treatment process and soil profile.  Effective control of long term impacts on groundwater quality relies on monitoring and effective source control. 

As described in Order No. 05-01-208, even in the best of circumstances, long-term land discharge of treated municipal wastewater may potentially degrade groundwater with salt and the individual components of salts (e.g. sodium, chloride).

Certain constituents such as sodium, chloride and boron are useful indicator parameters for evaluating the extent to which effluent reaches and potentially degrades groundwater. Other constituents, including iron and manganese are useful indicators to determine whether components of the WWTF with high-strength waste constituents, such as sludge handling facilities, may be ineffective in containing waste.

The District’s WDRs (waste discharge requirements) contain monitoring and reporting requirements, which include tri-annual monitoring of groundwater. The reports below present groundwater monitoring data obtained during the past year's monitoring events.