October 26, 2015 - Important Information About Your Drinking Water

IMPORTANT INFORMATION ABOUT YOUR DRINKING WATER

ESTE INFORME CONTIENE INFORMACION IMPORTANTE ACERCA DE SU AGUA POTABLE. HAGA QUE
ALGUIEN LO TRADUZCA PARA USTED, O HABLE CON ALGUIEN QUE ENTIENDA.

The Monroeville Municipal Authority (MMA) Has Levels of Total Trihalomethanes (TTHMs)
Above Drinking Water Standard
s

Our water system recently exceeded a drinking water standard. Although this incident was not an emergency,
as our customers, you have the right to know what happened and what we are doing to correct this situation.
We routinely monitor for drinking water contaminants. Quarterly testing results we received on October 26,
2015, show that one sampling site in the eastern portion of our distribution system has exceeded the standard,
or maximum contaminant level (MCL), for TTHMs. The standard for TTHMs is a Locational Running Annual
Average (LRAA) of 0.0800 mg/L. TTHMs were found at an LRAA of 0.08602 mg/L. The fourth quarter results
indicate a decrease in TTHM concentrations compared to the third quarter results, but the LRAA still exceeds the
MCL.

What should I do? You do not need to use an alternative water supply . However, if you
have specific health concerns, especially for the young, old, or people with compromised immune systems, you
may want to consult your doctor. Certain home water treatment devices utilizing granulated activated carbon
filters are effective in lowering TTHM levels and can be used to reduce your exposure.

What does this mean? This is not an immediate risk . If it had been, you would have been notified
immediately. The MMA is informing you because you have the right to know about problems with your drinking
water even if there is no immediate health threat. The U.S. Environmental Protection Agency sets standards for
controlling the levels of disinfectants and disinfection by-products (DBPs) in drinking water because some people
who drink water containing TTHMs in excess of the MCL, over many years, may experience problems with their
liver, kidneys, or central nervous system, and may have an increased risk of cancer.

What happened? The MMA purchases treated water from the Wilkinsburg Penn Joint Water Authority
(WPJWA). WPJWA was recently mandated to modify the disinfection process at its treatment plant. The
modified disinfection process combined with environmental factors, such as high concentrations of organic
material in the source water, system water age, and water temperature, promoted the increased formation of
DPBs, and specifically TTHMs, in the treated water. The water supplied by WPJWA to the MMA during the third
and fourth quarter of 2015 had elevated levels of TTHMs prior to entry into the MMA system.

What is being done? The MMA is working to correct the problem. Control strategies implemented include
increased system flushing and reduced tank storage volumes to minimize TTHM formation. Modification of MMA
disinfection practices, while continuing to provide adequate protection against pathogens, is also in effect. The
MMA expects to return to compliance by the first quarter of 2016. Effective April 2016, the MMA is
switching water suppliers to the Municipal Authority of Westmoreland County (MAWC). MAWC
utilizes an alternate disinfection process which should result in lower TTHM levels throughout the
MMA system.

For more information, please contact the MMA Office at 412-372-2677 or on the web at
www.monroevillewater.org.

Please share this information with all the other people who drink this water, especially those who
may not have received this notice directly (for example, people in apartments, nursing homes,
schools, and businesses). You can do this by posting this notice in a public place or distributing
copies by hand or mail.

This notice is being sent to you by the Monroeville Municipal Authority, 219 Speelman Lane, Monroeville, PA
15146.

PWS ID#: 5020027 Date distributed: November 9, 2015