TTHM Violation
- From
- Howard Croft
- To
- Mike Prysby , Stephen Busch
Mike,
lam sending you and Steve a copy of the letter that we plan to include with the violation notice. This is set to
go out early next week and I wanted to get your opinion. We have considered some type of water summary to
accompany this as well but I am not certain if I can pull that together in time unless you have a specific
recommendation.
We continue to post the Monthly Operation Reports online within two weeks after the end of each month.
Thank you,
Howard Croft
Public Works Director
City of Flint
1101 S. Saginaw Street
Flint, MI 48502
PH# 810.766.7135 Ext.2043
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Water Quality Update
City of Flint Resident:
In January we alerted you to the presence at that time of excess TTHM (total trihalomethanes) in Flint’s
public water supply. TTHM — a byproduct of the water chlorination process — was found to be in excess
of state guidelines (80 parts per billion) beginning in May 2014 and continuing into August. As soon as
this excess concentration was discovered, we began taking steps to reduce it to within acceptable
guidelines.
We are pleased to report that we have succeeded in bringing the water to within acceptable
guidelines. While we continue to work on improving aesthetic qualities, such as discoloration or odor,
you can be confident that the water provided to you today meets all state standards.
How did we did do this? With the help of LAN engineering, we upgraded the ozone treatment process
at the Water Treatment Plant; increased water main/hydrant flushing to reduce stagnation; conducted
small-scale testing of treatment to identify areas of improvement; improved overall plant operations;
and enhanced the distribution system through water-circulation modeling.
By November, all but one testing site was below the allowable levels and our most recent testing in
February showed that every testing site was well below allowable levels, as shown below:
City of Flint
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Water Quality Update
The Michigan Department of Environmental Quality (MDEQ) has been monitoring our progress, as noted
in its March 5, 2015 letter to the city:
“We are encouraged by the results from the most recent round of compliance
samples collected on February 17, 2015, which naw show individual TTHM levels at
less than half of the 0.080 mg/L standard ot ail locetions throughout the City’s
system. Operational Evaluation Reports from December 2014, and February 2015,
have identified possible causes and corrective measures for the previous elevated
TTHM ievels, which we encourage the City to continue implementing. These
madifications have likely contributed in part to the reduction in TTHM levels
reported in the most recent querter, and suggest the Cy may be able to achieve
compliance with the TTHM standard at all sites by continuing these efforts.” MDEQ
However, because MDEQ monitoring of excess concentrations is based on four quarters of test results,
we are required to again notify you that based on the most recent four quarters of test results (which
includes excess concentrations beginning in April), the City’s annual quarterly testing average is not yet
below the state’s allowable average.
The attached notice (“Important Information about Your Drinking Water”) includes legally required
language that summarizes the situation. Please review it and contact us with any questions.
In addition, included in this mailing is a list of Frequently Asked Questions. We also have created a place
for regular updates on the city’s website at cityofflint.com. We encourage residents who have concerns
about the quality of their water to contact us immediately so on-site testing can be scheduled.
If you have questions about this report or would like a test done at your home,
free of charge, please call us at 810-787-6537.
Maintaining safe water and improving its quality is a top priority, and we apologize for the concerns
these notices have raised. We have taken many steps to improve the safety and quality of our water
supply and will be taking more. As you may know, we have recently received a series of
recommendations from several sources, including a report from international urban water system
consultants, Veolia North America. We will be working with our recently created Citizen Advisory
Committee and our Technical Advisory Committee to continue making improvements. Please track our
progress on our website at cityofflint.com.
Sincerely,
City of Flint
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