Chloramination Q&A

Questions & Answers

Why is the city of St. Petersburg changing the way it treats drinking water?

While the city of St. Petersburg already complies with all current water quality regulations, this change is being made in advance of new, stricter water quality standards that will go into effect in the future under the national Safe Drinking Water Act. Chloramination was selected as the method of choice because it is the best and most cost-effective way of maintaining compliance under the new regulations. The use of chloramination is 20 percent less expensive than alternative methods of treatment, and at the same time reduces the formation of suspected cancer-causing compounds. And, by switching to chloramination, a more consistent water quality will be maintained throughout the city's distribution system.

The city is not, however, changing any of its other treatment practices. We will continue to aerate, soften and filter the water as we currently do. We also will continue to add the optimum amount of fluoride for prevention of tooth decay.

The change from chlorine disinfectant to chloramine disinfectant will:

What steps are being taken to deliver chloraminated water to city customers?

Before the conversion to chloramination by the city of St. Petersburg, the Public Utilities Department is taking steps to prepare for the change. These steps include:

1. Selecting a final distribution system disinfectant.
2. Implementing chemical feed system modifications.
3. Evaluating the impact of the new chemicals on its corrosion control and system flushing practices.
4. Engaging in re-permitting of its public water system permit with the Florida Department of Environmental Protection.
5. Preparing the water distribution system by aggressive flushing in certain areas of the city.

Is anything else added to the water before delivery to the customers?

The city of St. Petersburg will continue to aerate, lime soften and filter our drinking water. We also will add the optimum amount of fluoride to assist in the prevention of tooth decay.

Will I notice a difference in the taste or odor of my water?

Residents who will receive chloraminated water may notice a slight change in taste or odor. Chlorine will become much more difficult to detect. In two different tastes tests held in the summer of 2001, seven out of eight tasters either liked the taste better or could not tell the two waters apart!

Will there be any noticeable difference in my water due to the switch to chloramines?

Some temporary impacts may be noticed in isolated areas as the chloraminated water is introduced into the distribution system. Some customers may notice a temporary variation in water color as well as possible sediment in the water. These temporary impacts to water quality are similar to those experienced when a water main is replaced or routine maintenance is performed on the water distribution system and will cease as the system stabilizes.

I have a fish aquarium in my home. Am l going to have to do anything different to the water?

Yes. Since fish take chloramines directly from the water into their bloodstream, the chloramines must be removed from the water used by your fish and other aquatic animals. This process is similar to what you may already be doing to remove chlorine from your aquarium water. Some people, however, may simply let the water sit out before use so the chlorine will dissipate. Chloramines, however, will not dissipate in this manner. Water conditioners specifically designed for removing both chlorine and chloramines are commercially available. Pet stores or pet suppliers should be able to provide information on de-chloramination products and instructions (A more thorough answer to this question can be found in the Special Information for Pet Stores and Fish Aquarium Owners page of the web site.)

Will the use of chloramines affect kidney dialysis centers and patients?

Yes. Kidney dialysis patients must remove chloramines from the water they use in dialysis machines. Depending on the method of chlorine removal a patient now uses, some modifications to this process may be necessary to remove chloramines. Patients should check with their dialysis physician who can recommend the proper type of water treatment. Dialysis centers will be notified in ample time to make any necessary changes to their equipment.

Will I have to change the way I treat my swimming pool water?

No additional treatment should be necessary. However, you might find that there is a slight increase in chlorine demand. That means that you may have to add a little more chlorine than usual to get to the level you typically maintain in the pool after you top it off with chloraminated tap water.

Will my home filtration system be affected in anyway?

You may find that you have to replace filters (particularly activated charcoal filters) more often than usual. The difference should be negligible. Be sure to follow manufacturer's recommendations.

Will chloraminated water be safe for my dog or cat?

Yes.

When will the change be implemented?

May 2002.