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Water Quality

 

IMPORTANT INFORMATION REGARDING YOUR DRINKING WATER
December 2016

The Newport Water Division is a Public Water System and routinely tests at various sites within the distribution system for Disinfection Byproducts (DBPs).  EPA sets standards for controlling the levels of disinfectants and DBPs in drinking water, including total triahalomethanes (TTHMs).  The Environmental Protection Agency (EPA) standard for TTHMs as part of the Stage 1 Disinfectants and Disinfection Byproducts Rule (DBPR) effective January 1, 2002 was 80 parts per billion (ppb) for an annual running average. Compliance for TTHM was based on a running aritmetic average, computed quarterly, of all quarterly averages of the eight (8) samples that Newport Water analyzed.  Newport Water Division was required to collect samples for the TTHM analysis during the first two weeks of each quarter.

Many water systems treat water with a chemical disinfectant, such as chlorine, in order to inactivate pathogens that case disease.  While disinfectants are effective in controlling many harmful microorganisms, they react with organic and inorganic matter in the water to form DBPs, some of which pose health risks at certain levels.

Some people who drink water-containing trihalomethanes 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 getting cancer.  The public health benefits of chlorine disinfection practices are significant and well recognized.  Consequently, one of the most complex questions facing water supply professionals is how to reduce risks from disinfectants and DBPs while providing increased protection against microbial contaminants.

The Stage 2 Disinfectants and Disinfection Byproducts Rule builds upon Stage 1 DBPR to address higher risk public water systems for protection measures beyond those required as part of the Stage 1 DBPR.  As part of the Stage 2 DBPR the RIDOH reviewed and approved the monitoring sites for TTHM compliance.  The Newport Water Division under the Stage 2 DBPR collects samples from the four (4) approved monitoring sites within the distribution system on a quarterly basis.  Compliance for TTHM per the Stage 2 DBPR is based on a locational annual running average not exceeding 80 ppb.  That is at each monitoring site the four quarter running average must not exceed 80 ppb which differs from the Stage 1 DBPR which determined compliance as running annual average of all the samples taken in the quarter.  The compliance monitoring for the Stage 2 DBPR became effective October 1, 2013.  The schedule for the collection of the quarterly samples for Stage 2 DBPR has also changed; samples will be collected during the first week of the second month of each quarter ( February, May, August, and November) starting in the fourth quarter of 2013.

The Safe Drinking Water Act contains provisions to allow for compliance deadline extensions for Water Systems that need additional time for required capital improvements to be completed.  The Newport Water Division requested a compliance extension from the RIDOH.  After review of the required documentation, the RIDOH granted a 15 month extension to the Stage 2 DBPR compliance monitoring beginning January 1, 2015.  The compliance extension was supported by the current construction underway of the new Lawton Valley Water Treatment Facility and the improvements to the Station 1 Water Treatment Facility.  Starting in the fourth quarter of 2013 Newport Water began using the four (4) approved Stage 2 monitoring sites to calculate quarterly TTHM averages.  TTHM compliance through the end of 2014 will continue to use a running annual (four quarter) average similar to the method used in the Stage 1 DBPR.  The Stage 2 DBPR locational running annual average calculation for TTHM compliance began with the first quarter of 2015.  However, the first true "four quarter running average" begins with fourth quarter of 2015.

In January 2012 the City of Newport awarded a design build contract to the joint venture of AECOM - C.H. Nickerson for the Station No. 1 Water Treatment Plant Upgrade and the New Lawton Valley Water Treatment Plant.  The value of the conract is $67,000,000.00.  Prior to the award of the contract, Newport Water conducted detailed pilot testing to determine the optimal treatment method to reduce TTHMs.  Based on the results of the studies, Newport Water is requiring advanced water treatment processes to be included in the improvements to the treatment plants in order to assure the sufficient level of organics removal in order to control TTHMs.  Construction activities at both facilities began in September 2012.  The Phase 1 treatment improvements at the Station 1 facility went into service on May 30, 2013.  The Phase 2 treatment improvements at Station 1 went into service on July 25, 2014. The new Lawton Valley facility went into service September 17, 2014.  

The following are the reported levels for TTHMs compliance for 2007 to date:

 
Period Dates Levels
2007
1st Quarter April 1, 2006 to March 31, 2007 78.86 ppb
2nd Quarter July 1, 2006 to June 30, 2007 77.56 ppb
3rd Quarter October 1, 2006 to September 30,2007 69.58 ppb
4th Quarter January 1, 2007 to December 31, 2007 64.27 ppb
2008
1st Quarter April 1, 2007 to March 31, 2008 65.54 ppb
2nd Quarter July 1, 2007 to June 30, 2008 66.84 ppb
3rd Quarter October 1, 2007 to September 30, 2008 76.63 ppb
4th Quarter January 1, 2008 to December 31, 2008 89.30 ppb *
2009
1st Quarter April 1, 2008 to March 31, 2009 86.58 ppb *
2nd Quarter July 1, 2008 to June 30, 2009 81.76 ppb *
3rd Quarter October 1, 2008 to September 30, 2009 81.34 ppb *
4th Quarter January 1, 2009 to December 31, 2009 72.47 ppb
2010
1st Quarter April 1, 2009 to March 31, 2010 71.04 ppb
2nd Quarter July 1, 2009 to Jun 30, 2010 68.86 ppb
3rd Quarter October 1, 2009 to September 30, 2010 64.26 ppb
4th Quarter January 1, 2010 to December 31, 2010 60.68 ppb
2011
1st Quarter April 1, 2010 to March 31, 2011 62.64 ppb
2nd Quarter July 1, 2010 to June 30, 2011 66.43 ppb
3rd Quarter October 1, 2010 to September 30, 2011 73.44 ppb
4th Quarter January 1, 2011 to December 31, 2011 76.74 ppb
2012
1st Quarter April 1, 2011 to March 31, 2012 77.92 ppb
2nd Quarter July 1, 2011 to June 30, 2012 78.17 ppb
3rd Quarter October 1, 2012 to September 30, 2012 80.78 ppb*
4th Quarter January 1, 2012 to December 31, 2012 77.62 ppb
2013
1st Quarter April 1, 2012 to March 31, 2013 79.30 ppb
2nd Quarter July 1, 2012 to June 30, 2013 82.9 ppb*
3rd Quarter October 1, 2012 to September 30, 2013 70.42 ppb
2013 - Stage 2 DBPR Begins
4th Quarter January 1, 2012 - to December 31, 2013 68.29 ppb
2014
1st Quarter April 1, 2013 to March 31, 2014 66.77 ppb
2nd Quarter July 1, 2013 to June 30, 2014 70.4 ppb
3rd Quarter October 1, 2013 - September 30, 2014 72.1 ppb
 4th Quarter  January 1, 2013 - December 31, 2014  64.39 ppb

Stage 2 DBPR Locational Compliance Begins

2015

Site 1

Site 2

Site 3

Site 4

1stQuarter

April 1, 2014 to March 31, 2015

6.9 ppb

18.7 ppb

12.0 ppb

11.9 ppb

2nd Quarter

July 1, 2014 to June 30, 2015

13.1 ppb

30.8 ppb

22.0 ppb

22.6 ppb

3rd Quarter

October 1, 2014 to September 30, 2015

25.0 ppb

46.2 ppb

36.2 ppb

36.8 ppb

4th Quarter

January 1, 2015 to December 31, 2015

33.7ppb

59.0 ppb

50.8 ppb

48.9 ppb

 

2016

Site 1

Site 2

Site 3

Site 4

1st Quarter

April 1, 2015 to March 31, 2016

40.1 ppb

58.3 ppb

51.7 ppb

52.5 ppb

2nd Quarter

July 1, 2015 to June 30, 2016

42.4 ppb

56.0 ppb

54.7 ppb

51.6 ppb

3rd Quarter

October 1, 2015 – September 30, 2016

46.6 ppb

65.8 ppb

65.7 ppb

59.9 ppb

 4th Quarter January 1, 2016 - December 31, 2016 46.6 ppb 67.3 ppb 65.9 ppb 57.6 ppb

 

  * - MCL Violation

 

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