System required to comply with the monitoring/reporting and maximum contaminant level (MCL) requirements of the Stage 1 Disinfectants and Disinfection By-Products Rule (Stage 1 DBPR) by sampling and reporting the results annually for total trihalomethanes (TTHM) and five haloacetic acids (HAA5). The cost of $900.00 is the approximate amount for required sampling which was increased to quarterly due to an MCL exceedance.