Figure: 30 TAC §290.117(e)(4)

Water Quality Parameter (WQP) Entry Point and Distribution Monitoring
After Optimal Water Quality Parameter (OWQP) Determination
 Monitoring Period  Post-OWQP Designation WQP List Location  Frequency
 After determination
 of approved OWQP
 ranges by the
 executive director		  pH, alkalinity, orthophosphate or
 silica1, and calcium2		 Routine number of
distribution sites		  Quarterly
 pH, alkalinity dosage rate and
 concentration3, and inhibitor
 dosage rate and inhibitor residual4		 All entry points  At least every
 two weeks

1Orthophosphate must be measured if an inhibitor containing a phosphate compound is used. Silica must be measured if an inhibitor containing silicate compound is used.
2Calcium must be measured if calcium carbonate stabilization is used as part of corrosion control.
3Alkalinity must be measured if alkalinity is adjusted as part of corrosion control.
4Inhibitor dosage rates and inhibitor residual concentrations (orthophosphate or silica) must be measured if an inhibitor is used.