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Response to NTWD Chlorine Residual


Unwanted Ammonia and low Chlorine residuals

Potential underlying causes:   Water age and Nitrification

The longer the aged water sits the lower the Chlorine residual gets and the higher the Ammonia levels get, this is called Nitrification.   


1:           Maintaining an optimized Chlorination process:    CCSUD optimizes our treatment process and tests our water at multiple locations every day before it goes out into the distribution system.

2:           Reducing the water age:   CCSUD controls the water tower levels to minimize the amount of time the treated water sits in the water tanks, lines and towers.  Flushing keeps the water moving and doesn’t allow the water to age in the water lines.  It is continually replaced with fresh water.

3:           Preventative maintenance:   CCSUD annually conducts free Chlorine burns to keep the Ammonia levels safe.  TCEQ requires quarterly samples of Nitrate and Nitrite that we conduct once a month and monitor every flush for chlorine residual, pH, and turbidity.

4:           Replacing aging infrastructure:   CCSUD budgets the replacement of old lines and equipment each year.  Currently CCSUD is engaged in a $4M project to upgrade some water lines while overhauling much of the treatment plant.

5:           Maintain and Execute and effective Nitrification Action Plan:   CCSUD monitors Nitrate and Nitrite levels monthly while the Total and Free Chlorine, Monochlorimes and Free Ammonia along with pH and Alkalinity levels at 5 locations in the water system are monitored twice weekly.  Should any levels trend above or below levels that we have set, then CCSUD personnel makes the changes necessary to get the levels back to our limits. 

6:           Manage disinfectants:   CCSUD personnel test the flush point water out in the system as well as bringing some back to test at the treatment plant lab.  Water is continually monitored and tested within the treatment plant and in the water system daily.