Fire Hydrant Flushing Program

The Fire Hydrant Flushing Program is completed each year in the Fall.  City crews flush fire hydrants for approximately a four week period.  

The purpose of the program is to help maintain water quality standards and the fire protection system.  Citizens may experience brief periods of discolored water or low pressure which is normal during flushing operations.

What does “hydrant flushing” mean?

The Water Division will forcefully draw the chlorinated water through fire hydrants for several weeks. The flushing also allows sediments/minerals that have collected in the water mains to be washed out. Additionally, the flushing process is part of the Water Division’s annual hydrant exercising program. 

Will I see a drop in water pressure due to the flushing?

Most customers will not see a drop in water pressure. If a change in pressure does occur it usually lasts for only 30 minutes or less. 

Will hydrant flushing in my area cause cloudiness or sediment in my water?

The flushing process can stir up sediments and minerals in water mains occasionally resulting in some short-term cloudy water conditions. If you encounter such conditions please flush the water from tap until the cloudiness dissipates. If you experience this condition for an extended period of time please call the PublicWorks Department.

Why does the Water Treatment Plant convert from chloramines to free chlorine each Fall?

Rock Island water is disinfected with chloramines for most of the year. Chloramines are a better long-term choice because they produce lower levels of disinfectant by-products like trihalomethanes which are possible carcinogens formed when chlorine mixes with natural organic substances or matter in water. Chloramines are more stable than chlorine and remain in the distribution system for a longer period of time. However, free chlorine is a more aggressive disinfectant and this temporary change in the water treatment process denies bacteria the ability to form resistances to the usual disinfection treatment process.

What are chloramines?

Chloramines are a disinfectant used in drinking water to remove bacteria and viruses.

What is free chlorine?

Free chlorine is a slightly stronger disinfectant than chloramines which may be used to remove slightly more resistant bacteria and viruses that may be found in the water distribution system. 

When does the conversion occur?

The conversion starts several weeks before the Fire Hydrant Flushing Program begins and will continue through the duration of the flushing program.

Will my water taste different after the conversion back to chloramines?

Possibly, however, most consumers prefer the less-noticeable chloramines. Free chlorine may have a bit of a chemical odor or smell slightly like water in a swimming pool. Each individual customer has his or her own sensitivity level to the taste and/orodor of free chlorine though many detect no change at all. 

Is free chlorine and chloraminated water safe?

Yes, both are safe and effective. We are in regular communication with the Department of Environmental Protection and strictly follow their guidelines on minimum and maximum chlorine levels. Both forms of chlorinated water are safe for people and animals to drink, for cooking and bathing, watering the garden, and for all other common uses. However, precautions must be taken to remove or neutralize chloramines and free chlorine during the kidney dialysis process, in the preparation of water for fish tanks and ponds, and for businesses requiring highly-processed water. Ade-chlorination procedure optimized for the removal chloramines will equally remove free chlorine. 

Why are free chlorine and chloramines harmful for dialysis patients?

Both free chlorine and chloramines may harm kidney dialysis patients during the dialysis process if it is not removed from water before passing into the bloodstream. Like everyone else, dialysis patients may drink water treated with either free chlorine or chloramines because the digestive process neutralizes these chemicals before they can enter the blood stream.