HomeMy WebLinkAbout2007-10-09; Municipal Water District; 642; Drinking Water Quality Public Health GoalsCARLSBAD MUNICIPAL WATER DISTRICT - AGENDA Bll
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AB# 642
MTG. 10/09/07
DEPT. PW/M&O
APPROVAL OF CMWD DRINKING WATER
QUALITY AND SOURCE WATER QUALITY
RFI ATIVF TO PI IRI \C HFAI TH fiOAl 9
DEPT. HEAD fHOt/^
CITY ATTY. <£&-
CITYMGR. /,/—-"
RECOMMENDED ACTION:
1. Hold a Public Hearing to receive comments on the Carlsbad Municipal Water District's
Drinking Water Quality and Source Water Quality Relative to Public Health Goals.
2. Adopt Resolution No. 1306 approving the Report of the Carlsbad Municipal Water
District's Drinking Water Quality and Source Water Quality Relative to Public Health
Goals.
ITEM EXPLANATION:
California Health and Safety Code Section 116470(b) mandates that a Public Health Goal
(PHG) Report be prepared and a public hearing to review the report be held every three
years by public water system providers with more than 10,000 service connections. The
purpose of the legislative requirement is to give water system customers access to
information on levels of contaminants, including those that are below the mandatory
thresholds. The attached report is intended to provide information to the public in addition to
the required Annual Water Quality Report mailed to each customer before July 1st.
The attached Carlsbad Municipal Water District (CMWD) PHG report compares the District's
drinking water quality and source water quality with public health goals (PHGs) adopted by
California EPA's Office of Environmental Health Hazard Assessment (OEHHA) and with
maximum contaminant level goals (MCLGs) adopted by the United States Environmental
Protection Agency (USEPA). PHGs and MCLGs are not enforceable standards and no action
to meet them is mandated.
The CMWD's source of drinking water is supplied from the Metropolitan Water District's
(MWD) Skinner Treatment Plant via the San Diego County Water Authority (SDCWA)
aqueduct system.
The CMWD's water system complies with all of the health-based drinking water standards
and maximum contaminant levels (MCLs) required by the California Department of Health
Services and the USEPA. The Department of Health Services will not require the District to
take any action to reduce or eliminate any exceedance of a Public Health Goal.
FISCAL IMPACT:
None.
FOR CITY CLERKS USE ONLY.
BOARD ACTION: APPROVED
DENIED
CONTINUED
WITHDRAWN
AMENDED
D
D
D
D
CONTINUED TO DATE SPECIFIC D
CONTINUED TO DATE UNKNOWN D
RETURNED TO STAFF D
OTHER-SEE MINUTES D
Page 2
ENVIRONMENTAL IMPACT:
The Planning Director has determined that the action for which approval is proposed does not
constitute a project as defined in Section 15378 of the State CEQA Guidelines and is
therefore not subject to CEQA.
EXHIBITS:
1. Resolution No. 1306 approving the Report of the Carlsbad Municipal Water District's
Drinking Water Quality and Source Water Quality Relative to Public Health Goals.
2. Copy of the "Report of the Carlsbad Municipal Water District's Drinking Water Quality and
Source Water Quality Relative to Public Health Goals."
DEPARTMENT CONTACT: Steve Plyler 760-438-2722 splyl@ci.carlsbad.ca.us
E&H0I7 I
1 RESOLUTION NO. 1306
2 A RESOLUTION OF THE BOARD OF DIRECTORS OF
CARLSBAD MUNICIPAL WATER DISTRICT (CMWD),
APPROVING THE REPORT OF THE CARLSBAD
. MUNICIPAL WATER DISTRICT'S DRINKING WATER
QUALITY AND SOURCE WATER QUALITY RELATIVE TO
5 PUBLIC HEALTH GOALS.
6 WHEREAS, the Carlsbad Municipal Water District (CMWD) is required to
7 prepare a report comparing the District's drinking water quality and source water quality
8 with public health goals (PHGs) adopted by California EPA's Office of Environmental
9 Health Hazard Assessment (OEHHA) and with maximum contaminant level goals
10 (MCLGs) adopted by the USEPA. PHGs and MCLGs are not enforceable standards and
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no action to meet them is mandated; and
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WHEREAS, the CMWD's source of drinking water is supplied from the
Metropolitan Water District's (MWD) Skinner Treatment Plant via the San Diego County
15 Water Authority (SDCWA) aqueduct system; and
16 WHEREAS, California Health and Safety Code Section 116470(b) mandates that
17 a Public Health Goal (PHG) Report be prepared and a public hearing to review the
18 report be held every three years by public water system providers with more than
19 10,000 service connections; and
20 WHEREAS, a Public Hearing was held on this day to receive public comment
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regarding the Report.
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NOW, THEREFORE, BE IT RESOLVED by the Carlsbad Municipal Water
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District Board of the City of Carlsbad, California, as follows:
25 1. That the above recitations are true and correct.
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1 2. That the Report of the Carlsbad Municipal Water District's Drinking Water
2 Quality and Source Water Quality Relative to Public Health Goals is hereby approved.3 //
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PASSED, APPROVED AND ADOPTED at a Special Meeting of the Board of
Directors of the Carlsbad Municipal Water District of the City of Carlsbad on the 9th
day of October, 2007, by the following vote to wit:
AYES: Board Members Lewis, Kulchin, Hall and Packard.
NOES: None.
ABSENT: Nygaard.
ATTEST:
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M. WOG(D) Secretaire}!
CARLSBAD MUNICIPAL WATER DISTRICT
REPORT ON WATER QUALITY
RELATIVE TO PUBLIC HEALTH GOALS
2004 - 2006
Background:
Section 116470 of the California Health and Safety Code specify that larger (>10,000 service
connections) water utilities prepare a special report by July 1, 2007 if their water quality
measurements have exceeded any Public Health Goals (PHGs). PHGs are non-enforceable goals
established by the Cal-EPA's Office of Environmental Health Hazard Assessment (OEHHA). The
law also requires that where OEHHA has not adopted a PHG for a constituent, the water suppliers
are to use the maximum contaminant level goals (MCLGs). MCLGs are non-enforceable goals
adopted by USEPA. Only constituents which have a California primary drinking water standard
and for which either a PHG or MCLG has been set are to be addressed.
There are a few constituents that are routinely detected in water systems at levels usually well
below the drinking water standards for which no PHG nor MCLG has yet been adopted by OEHHA
or USEPA including Total Trihalomethanes. These will be addressed in a future required report
after a PHG has been adopted.
The drinking water quality of the Carlsbad Municipal Water District (CMWD) meets all State of
California, Department of Health Services and USEPA drinking water health-based maximum
contaminant level (MCL) standards set to protect public health.
What Are PHGs?
PHGs are set by the California Office of Environmental Health Hazard Assessment (OEHHA)
which is part of Cal-EPA and are based solely on public health risk considerations. None of the
practical risk-management factors that are considered by the USEPA or the California Department
of Health Services (CDHS) in setting drinking water standards (MCLs) are considered in setting the
PHGs. These factors include analytical detection capability, treatment technology available,
benefits and costs. The PHGs are not enforceable and are not required to be met by any public
water system. MCLGs are not enforceable and are the federal equivalent to PHGs.
Water Quality Data Considered:
All of the water quality data collected from the CMWD water system between 2004 and 2006 for
purposes of determining compliance with drinking water standards was considered. This data was
all summarized in the 2004, 2005, and 2006 Annual Water Quality Reports which were mailed to
all of our customers each year.
Guidelines Followed:
The Association of California Water Agencies (ACWA) formed a workgroup which prepared
guidelines for water utilities to use in preparing these newly required reports. The ACWA
guidelines were used in the preparation of our report. No guidance was available from state
regulatory agencies.
Best Available Treatment Technology and Cost Estimates:
Both the USEPA and CDHS adopt what are known as BAT's or Best Available Technologies
which are the best known methods of reducing contaminant levels to the MCL. Costs can be
estimated for such technologies. However, since many PHGs and all MCLGs are set much lower
than the MCL, it is not always possible, nor feasible to determine what treatment is needed to
further reduce a constituent downward to or near the PHG or MCLG, many of which are set at zero.
Estimating the costs to reduce a constituent to zero is difficult, if not impossible because it is not
possible to verify by analytical means that the level has been lowered to zero, hi some cases,
installing treatment to try and further reduce very low levels of one constituent may have adverse
effects on other aspects of water quality.
Constituents Detected That Exceed a PHG or a MCLG:
The following is a discussion of constituents that were detected at a level above the associated
PHG, or if there is no PHG, above the MCLG.
Radionuclides:
Gross Alpha and Gross Beta:
The MCL for Gross Alpha is 15 pCi/L and for Gross Beta is 50 pCi/L. There is no PHG set for
Gross Alpha and Gross Beta but in 2005 the USEPA set the MCLG at zero for each.
The level of Gross Alpha detected in CMWD's source water supplied by Metropolitan Water
District (MWD) for 2004 ranged between None Detected (ND) and 4.0 pCi/L with an average of
3.4 pCi/L. For 2005 the range was ND and 5.5 pCi/L with an average of 4.2 pCi/L. For 2006 the
range and average was ND. Gross Beta for 2004 ranged between ND and 4.1 pCi/L with an average
of ND. The range and average for 2005 and 2006 were all ND.
Results of local quarterly sampling at one location in 2006 for Gross Alpha and Gross Beta are as
follows: (3-7-06) 1.07 and 4.27 pCi/L respectively, (6-13-06) 2.51 and 3.16 pCi/L, (9-7-06) 2.97
and 3.63 pCi/L, (12-7-06) 1.13 and 1.39 pCi/L.
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Radioactive contaminants come from erosion of natural deposits of certain minerals that are
radioactive and may emit a form of radiation known as alpha radiation, photons and beta radiation.
With Gross Alpha and Gross Beta there is an increased risk of cancer.
Uranium:
The MCL for Uranium is 20 pCi/L. A PHG of 0.43 pCi/L for Uranium was adopted by OEHHA in
August 2001.
The level of Uranium detected in CMWD's source water supplied by MWD for 2004 ranged
between None Detected (ND) and 2.4 pCi/L with an average of ND. For 2005 the range was 2.9
pCi/L and 3.2 pCi/L with an average of 3.0 pCi/L. For 2006 the range was ND and 1.2 pCi/L with
an average of ND.
The category for health risk associated with Uranium is carcinogenicity. OEHHA has determined
that the theoretical 70 year lifetime health risk associated with drinking water containing Uranium
above the PHG to be one excess cancer case per million (1 x ICT6) population and five excess
cancer cases per 100,000 (5 x 10"5) population for drinking water containing Uranium above the
state MCL.
Uranium is a naturally occurring radioactive element (radionuclide) that is ubiquitous in the earth's
crust. Uranium is found in ground and surface waters due to its natural occurrence in geological
formations. The average Uranium concentrations in surface, ground, and domestic water are 1, 3,
and 2pCi/L, respectively. The Uranium intake from water is about equal to the total from other
dietary components.
The BAT to lower Radionuclide levels to the MCL would include one or more of the following:
Enhanced Coagulation followed by Filtration, Lime Softening, Ion Exchange and Reverse Osmosis.
As previously stated, it is unclear whether treatment to lower a constituent below the PHG would
be feasible, as BAT's are designated for treatment to achieve compliance with the corresponding
MCL only, and not the PHG.
Coliform Bacteria:
During 2004, 2005, and 2006, CMWD collected between 132 and 165 samples each month for
coliform analysis. In December 2004, May 2005, and August 2005 one sample was found to be
positive for coliform bacteria. Follow up actions were taken and confirmation samples were all
negative. A maximum of 0.7% of these samples were positive in any month.
The MCL for coliform is 5% positive samples of all samples per month and the MCLG is zero. The
reason for the coliform drinking water standard is to minimize the possibility of the water
containing pathogens which are organisms that cause waterborne disease. Because coliform is only
a surrogate indicator of the potential presence of pathogens, it is not possible to state a specific
numerical health risk. While USEPA normally sets MCLGs "at a level where no known or
anticipated adverse effects on persons would occur", they indicate that they cannot do so with
coliforms.
Coliform bacteria are an indicator organism that are ubiquitous in nature and are not generally
considered harmful. They are used because of the ease in monitoring and analysis. If a positive
sample is found, it indicates a potential problem that needs to be investigated and additional
sampling conducted. It is not at all unusual for a system to have an occasional positive sample. It is
difficult, if not impossible, to assure that a system will never get a positive sample.
Chlorine and ammonia is added to CMWD's source water to assure that the water served is
microbiologically safe. The chloramine residual levels are carefully controlled to provide the best
health protection without causing the water to have undesirable taste and odor or increasing
disinfection byproduct levels. This careful balance of treatment processes is essential to continue
supplying CMWD customers with safe drinking water."
Other equally important measures that CMWD has implemented include: an effective cross-
connection control program, maintenance of a disinfectant residual throughout the system, an
effective monitoring and surveillance program and maintaining positive pressures in the
distribution system. CMWD currently uses all of the steps described by CDHS as "best available
technology" for coliform bacteria in Section 64447, Title 22, CCR.
Lead and Copper:
There is no MCL for Lead or Copper. Instead the 90th percentile value of all samples from a
representative number of household taps in the distribution system cannot exceed an Action Level
of 0.015 mg/1 for lead and 1.3 mg/1 for copper. The PHG for lead is 0.002 mg/1. The PHG for
copper is 0.17 mg/1.
The category of health risk for lead is damage to the kidneys or nervous system of humans. The
category of health risk for copper is gastrointestinal irritation. Numerical health risk data on lead
and copper have not yet been provided by OEHHA, the State agency responsible for providing that
information.
All of CMWD's source water samples for lead and copper in 2004, 2005, and 2006 were None
Detected (ND). Based on sampling of 36 household taps in the distribution system in 2006, our
90th percentile value for lead was ND and for copper was 0.464 mg/1.
CMWD's water system is in full compliance with the Federal and State Lead and Copper Rule.
Based on CMWD's sampling program it was determined, according to State regulatory
requirements, that CMWD meets the Action Levels for Lead and Copper. Therefore, CMWD has
been deemed by CDHS to have "optimized corrosion control" for the system.
In general, optimizing corrosion control is considered to be the best available technology to deal
with corrosion issues and with any lead or copper findings. CMWD continues to monitor water
quality parameters that relate to corrosivity, such as the pH, hardness, alkalinity, total dissolved
solids, and will take action if necessary to maintain the system in an "optimized corrosion control"
condition.
Since CMWD is meeting the "optimized corrosion control" requirements, it is not prudent to
initiate additional corrosion control treatment as it involves the addition of other chemicals and
there could be additional water quality issues raised. Therefore, no estimate of cost has been
included.
RECOMMENDATIONS FOR FURTHER ACTION:
The drinking water quality of the Carlsbad Municipal Water District meets all State of
California, Department of Health Services and USEPA drinking water standards set to protect
public health.
To further reduce the levels of the constituents identified in this report that are already significantly
below the health-based Maximum Contaminant Levels established, additional costly treatment
processes would be required. The effectiveness of the treatment processes to provide any
significant reductions in constituent levels at these already low values is uncertain.
The health protection benefits of these further hypothetical reductions are not at all clear and may
not be quantifiable. Therefore, no action is proposed.
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PROOF OF PUBLICATION
(2010 & 2011 C.C.P.)
This space is for the County Clerk's Filing Stamp
STATE OF CALIFORNIA
County of San Diego
I am a citizen of the United States and a resident
of the County aforesaid: I am over the age of
eighteen years and not a party to or interested in
the above-entitled matter. I am the principal
clerk of the printer of
North County Times
Formerly known as the Blade-Citizen and The
Times-Advocate and which newspapers have
been adjudicated newspapers of general
circulation by the Superior Court of the County of
San Diego, State of California, for the City of
Oceanside and the City of Escondido, Court
Decree number 171349, for the County of San
Diego, that the notice of which the annexed is a
printed copy (set in type not smaller than
nonpariel), has been published in each regular
and entire issue of said newspaper and not in any
supplement thereof on the following dates, to-wit:
Proof of Publication of
NOTICE OF PUBLIC HEARINGCITY OF CARLSBAD
The City of Carlsbad will hold a public hearingon Tuesday, October 9, 2007 at 6:00 p.m. in theCouncil Chambers of City. Hall, 1200 Carlsbad VillageDrive Carlsbad, California, to receive comments onand approve the Carlsbad Municipal Water District(CMWD1 2004 - 2006 Report on Water Quality Rela-tive to Public Health Goals (PHGs). The requiredPHG report is intended to provide information to thepublic in addition to the required Annual Water QualityReport mailed to each customer before July 1st.
Interested parties are invited to attend this meetinaand present their views and comments to the CMWDboard of directors.
Copies of the report are available forpublic inspectionat the City Clerk's Office, 1200 Carlsbad VillageDrive.
Written and telephone inquires may be directed toSteve Plvler of the Public Works Department, 595Q ElCamino Real, Carlsbad 92008; 438-2722.
CARLSBAD MUNICIPAL WATER DISTRICT
PUBLISH: September 29, 2007 NCT 2093064
September 29th, 2007
I certify (or declare) under penalty of perjury that
the foregoing is true and correct.
Dated at SAN MARCOS California
ThisOlst
5,day of October, 2007/("LCJ A.\.
Signature
Jane Allshouse
NORTH COUNTY TIMES
Legal Advertising
Water SupplyWater SupplyPublic Health GoalsPublic Health Goals2004 2004 ––2006 Report2006 ReportCarlsbad Municipal Water DistrictCarlsbad Municipal Water DistrictBoard of Directors MeetingBoard of Directors MeetingOctober 9, 2007October 9, 2007
Public HearingPublic Hearing••Summarize the TriSummarize the Tri--Annual Public Health Annual Public Health Goal (PHG) ReportGoal (PHG) Report••Receive and Respond to Public CommentReceive and Respond to Public Comment••Approve the CMWD 2004 Approve the CMWD 2004 ––2006 Report 2006 Report on Water Quality Relative to Public Health on Water Quality Relative to Public Health Goals (PHGs)Goals (PHGs)
Intent of Required PHG ReportIntent of Required PHG ReportProvide information to the publicProvide information to the publicin addition toin addition tothe required Annual Water Quality Report the required Annual Water Quality Report mailed to each customer before July 1stmailed to each customer before July 1st
RegulationsRegulationsVs.Vs.GoalsGoals
RegulationsRegulations••Maximum Contaminant Level (MCL)Maximum Contaminant Level (MCL)––Federal and State MandatesFederal and State Mandates––Maximum level allowed in drinking waterMaximum level allowed in drinking water––Regulatory definition of what is Regulatory definition of what is ““safesafe””
Goals Goals ––Not RequirementsNot Requirements••Maximum Contaminant Level Goal (MCLG)Maximum Contaminant Level Goal (MCLG)––Federal GoalFederal Goal••Public Health Goal (PHG)Public Health Goal (PHG)––State GoalState Goal
CMWD WaterCMWD WaterMeets all Federal & StateMeets all Federal & StateRegulations & Mandates Regulations & Mandates MCLsMCLs
Constituents That Exceed a PHG or Constituents That Exceed a PHG or a MCLG (nona MCLG (non--enforceable goals)enforceable goals)••RadionuclidesRadionuclides––Gross Alpha and Gross BetaGross Alpha and Gross Beta••UraniumUranium••Coliform BacteriaColiform Bacteria••CopperCopper
RadionuclidesRadionuclides••MCL for MCL for Gross AlphaGross Alphais 15 pCi/Lis 15 pCi/L••No PHGNo PHG••MCLG set at ZeroMCLG set at Zero••Source Water Sampling 2004 Source Water Sampling 2004 --20062006••Highest reading 5.5 pCi/L in 2005Highest reading 5.5 pCi/L in 2005••Local Quarterly Sampling in 2006Local Quarterly Sampling in 2006••Highest reading 2.97 pCi/LHighest reading 2.97 pCi/L
RadionuclidesRadionuclides••MCL for MCL for Gross BetaGross Betais 50 pCi/Lis 50 pCi/L••No PHGNo PHG••MCLG set at ZeroMCLG set at Zero••Source Water Sampling 2004 Source Water Sampling 2004 ––20062006••Highest reading 4.1 pCi/L in 2004Highest reading 4.1 pCi/L in 2004••Local Quarterly Sampling in 2006Local Quarterly Sampling in 2006••Highest reading 4.27 pCi/LHighest reading 4.27 pCi/L
UraniumUranium••MCL is 20 pCi/LMCL is 20 pCi/L••PHG set at 0.43 pCi/LPHG set at 0.43 pCi/L••Source Water Sampling 2004 Source Water Sampling 2004 ––20062006••Highest reading 3.2 pCi/L in 2005Highest reading 3.2 pCi/L in 2005
Coliform BacteriaColiform Bacteria••MCL is 5% positive samples per monthMCL is 5% positive samples per month••No PHGNo PHG••MCLG set at ZeroMCLG set at Zero••132 to 165 samples each month132 to 165 samples each month••One positive sample 12/04, 5/05, 8/05One positive sample 12/04, 5/05, 8/05••Maximum of 0.7% positive in any monthMaximum of 0.7% positive in any month
CopperCopper••No MCLNo MCL••9090ththPercentile value of a representative Percentile value of a representative number of samples cannot exceed an number of samples cannot exceed an action level (AL)action level (AL)••AL for Copper is 1.3 mg/lAL for Copper is 1.3 mg/l••PHG for Copper is 0.17 mg/lPHG for Copper is 0.17 mg/l
CopperCopper••AL is 1.3 mg/lAL is 1.3 mg/l••PHG is 0.17 mg/lPHG is 0.17 mg/l••Source Water Samples 2004Source Water Samples 2004--2006 2006 None Detected (ND)None Detected (ND)••Local sampling 36 household taps in 2006 Local sampling 36 household taps in 2006 9090ththpercentile value 0.464 mg/lpercentile value 0.464 mg/l
Carlsbad Municipal Water DistrictCarlsbad Municipal Water DistrictMeets all standards set to protect Meets all standards set to protect public healthpublic health
Questions from the BoardQuestions from the Board&&Public CommentPublic Comment