2019 Public Health Goals Reports of Compliance SCV Water Board - - PowerPoint PPT Presentation

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2019 public health goals reports of compliance
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2019 Public Health Goals Reports of Compliance SCV Water Board - - PowerPoint PPT Presentation

Sep 14, 2023 341 likes •749 views

August 6, 2019 2019 Public Health Goals Reports of Compliance SCV Water Board Meeting Public Water System Responsibilities All water systems with >10,000 connections must: Prepare a brief written report every 3 years Hold a

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SLIDE 1

2019 Public Health Goals Reports of Compliance

SCV Water Board Meeting

August 6, 2019

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SLIDE 2

Public Water System Responsibilities

  • All water systems with >10,000

connections must:

  • Prepare a brief written report every 3 years
  • Hold a public meeting explaining the report
  • Compliance with Health and S

afety Code, S ection 116470(b)

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SLIDE 3

Purpose of Report

  • Provide information about levels of contaminants

found in a drinking water supply that are above the Public Health Goals (PHG)

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SLIDE 4

Public Health Goals (PHGs)

  • PHGs are non-enforceable, health-based goals

established by the Office of Environmental Health Hazard Assessment (OEHHA)

  • Health risks based are set at the No Observable

Adverse Effects Level (NOAEL) and are often theoretical with assumptions and mathematical extrapolations

  • Compliance with PHG levels is

NOT required

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SLIDE 5

Maximum Contaminant Levels (MCLs)

  • The highest level of a contaminant that is allowed

in drinking water

  • MCLs are set as close to MCLGs as feasible using

the best available treatment technology and taking cost into consideration

  • MCLs are enforceable standards
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SLIDE 6

Health Effects Based on MCLs

  • US

EP A identified a lifetime “ reference risk range”

  • f 1 in 10,000 to 1 in 1,000,000
  • Maximum Contaminant Levels are set within this

range

  • US

EP A considers these levels to be safe and protective to human health

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SLIDE 7

Maximum Contaminant Level Goal (MCLG)

  • The level of a contaminant in drinking water

below which there is no known or expected risk to health

  • MCLGs allow for a margin of safety and are non-

enforceable public health goals

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SLIDE 8

Other Definitions

  • AL= Action Level
  • BAT = Best Available Technology
  • DLR = Detection Limit for Reporting
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SLIDE 9

Contents of the Report

  • List contaminants that have been detected above

the PHG

  • List contaminants that have been detected above

the MCLG where no PHG currently exists

  • Explain the potential health effects
  • Discuss the “ BAT” for bringing levels below the

corresponding PHG or MCLG

  • Give a cost estimate for bringing

levels below the corresponding PHG or MCLG

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SLIDE 10

Santa Clarita Valley Water PHGs

  • Arsenic
  • Lead & Copper
  • Total Coliform
  • Radiolonuclides
  • Hexavalent Chromium
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SLIDE 11

SCWD MCL vs. PHG for Arsenic

1 2 3 4 5 6 7 8 9 10 MCL PHG SCWD DLR 10 ppb 0.004 ppb 3.4 ppb 2 ppb ppb

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SLIDE 12

VWD MCL vs. PHG for Arsenic

1 2 3 4 5 6 7 8 9 10 MCL PHG VWD DLR 10 ppb 0.004 ppb 3.5 ppb 2 ppb ppb

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SLIDE 13

NWD MCL vs. PHG for Arsenic

1 2 3 4 5 6 7 8 9 10 MCL PHG Castaic Newhall Pinetree DLR 10 ppb 0.004 ppb <2 ppb <2 ppb 3.3 ppb 2 ppb ppb

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SLIDE 14

Potential Health Effects: Arsenic

  • Exposure to arsenic over many years can cause cancer
  • f the bladder, lungs, skin, kidneys, nasal passages,

liver and prostate

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SLIDE 15

BAT for Arsenic

  • Controls for arsenic include:
  • Reverse osmosis
  • Ion Exchange
  • Coagulation and filtration with ferric sulfate
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SLIDE 16

SCWD AL vs. PHG for Lead

2 4 6 8 10 12 14 16 AL PHG SCWD (tap) SCWD (source) DLR 15 ppb 0.2 ppb 5.6 ppb <5 ppb 5 ppb ppb

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SLIDE 17

VWD AL vs. PHG for Lead

2 4 6 8 10 12 14 16 AL PHG VWD (tap) VWD (source) DLR 15 ppb 0.2 ppb 2.6 ppb <5 ppb 5 ppb ppb

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SLIDE 18

NWD AL vs. PHG for Lead

2 4 6 8 10 12 14 16 AL PHG Castaic (tap) Castaic (source) Newhall (tap) Newhall (source) Pinetree (tap) Pinetree (source) Tesoro (tap) DLR 15 ppb 0.2 ppb <5 ppb <5 ppb 12 ppb <5 ppb <5 ppb <5 ppb 5.7 ppb 5 ppb ppb

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SLIDE 19

Potential Health Effects: Lead

  • Infants and children who drink water containing

lead in excess of the AL could experience delays in their physical and mental development

  • Adults who drink water containing lead over many

years could develop kidney problems, high blood pressure, and may be at an increased risk of getting cancer

  • DDW states that lead in the drinking water is

rarely the cause of lead poisoning

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SLIDE 20

SCWD AL vs. PHG for Copper

200 400 600 800 1000 1200 1400 AL PHG SCWD (tap) SCWD (source) DLR 1300 ppb 300 ppb 400 ppb <50 ppb 50 ppb ppb

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SLIDE 21

VWD AL vs. PHG for Copper

200 400 600 800 1000 1200 1400 AL PHG VWD (tap) VWD (source) DLR 1300 ppb 300 ppb 390 ppb <50 ppb 50 ppb ppb

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SLIDE 22

NWD AL vs. PHG for Copper

200 400 600 800 1000 1200 1400

AL PHG Castaic (tap) Castaic (source) Newhall (tap) Newhall (source) Pinetree (tap) Pinetree (source) Tesoro (tap) DLR

1300 ppb 300 ppb 220 ppb <50 ppb 500 ppb <50 ppb 340 ppb <50 ppb 510 ppb

50 ppb

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SLIDE 23

Potential Health Effects: Copper

  • Copper is an essential nutrient required by

humans

  • People who drink water with very high amounts of

copper could experience intestinal upset, liver damage or kidney damage

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SLIDE 24

BAT for Lead and Copper

  • Corrosion Control Treatment
  • S

CV Water supplies water characterized as:

  • Non-aggressive
  • Non-corrosive
  • S

CV Water has “ optimized corrosion control” as determined by DDW

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SLIDE 25

Total Coliform

  • Group of bacteria which are naturally present in

the environment

  • Commonly found in soil and plant material
  • Usually not harmful
  • Good indicator for the potential presence of

pathogens

  • If total coliforms are

present, must test for

  • E. coli
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SLIDE 26

SCWD MCL vs. MCLG for Total Coliform

0.0% 0.5% 1.0% 1.5% 2.0% 2.5% 3.0% 3.5% 4.0% 4.5% 5.0% MCL MCLG SCWD 5.0% 0% 1.6% ppb

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SLIDE 27

VWD MCL vs. MCLG for Total Coliform

0.0% 0.5% 1.0% 1.5% 2.0% 2.5% 3.0% 3.5% 4.0% 4.5% 5.0% MCL MCLG VWD 5.0% 0% 0.9% ppb

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SLIDE 28

Potential Health Effects: Total Coliform

  • Usually not harmful
  • Pathogens associated with TC can cause:
  • Diarrhea
  • Cramps
  • Nausea
  • Headaches
  • Fatigue
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SLIDE 29

Controlling Total Coliforms

  • Placement & construction of wells
  • Disinfection of groundwater
  • Maintaining disinfectant residual in distribution

system

  • Maintenance of distribution system
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SLIDE 30

SCWD MCL vs. PHG for Radionuclides

5 10 15 20 25 30 MCL MCLG PHG SCWD DLR

15 pCi/L

0 pCi/L Gross Alpha/ Uranium

0 pCi/L 8.6 pCi/L 3 pCi/L 20 pCi/L 0.43 pCi/L 7.4 pCi/L 1 pCi/L

pCi/L

Gross Alpha Uranium

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SLIDE 31

VWD MCL vs. PHG for Radionuclides

5 10 15 20 25 30 MCL MCLG PHG VWD DLR

15.0 pCi/L 0 pCi/L Gross Alpha/ Uranium 0 pCi/L 9.5 pCi/L 3 pCi/L 20 pCi/L 0.43 pCi/L 5.3 pCi/L 1 pCi/L

pCi/L

Gross Alpha Uranium

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SLIDE 32

NWD MCL vs. PHG for Radionuclides

5 10 15 20 25 30 MCL MCLG PHG Pinetree DLR

15.0 pCi/L 0 pCi/L Gross Alpha/ Uranium 0 pCi/L <3 pCi/L 3 pCi/L 20 pCi/L 0.43 pCi/L 9.1 pCi/L 1 pCi/L

pCi/L

Gross Alpha Uranium

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SLIDE 33

Potential Health Effects: Radionuclides

  • S
  • me people who drink water containing

alpha/ beta emitters or uranium in excess of the MCL over many years may have an increased risk

  • f getting cancer
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SLIDE 34

BAT for Radionuclides

  • Controls for Radionuclides include:
  • Ion exchange
  • Reverse osmosis
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SLIDE 35

VWD MCL vs. PHG for Hexavalent Chromium

2 4 6 8 10 MCL PHG VWD DLR

10 ppb 0.02 ppb 2.0 ppb 1 ppb

ppb

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SLIDE 36

NWD MCL vs. PHG for Hexavalent Chromium

2 4 6 8 10 MCL PHG Castaic Pinetree Newhall DLR

10 ppb 0.02 ppb <1 ppb <1 ppb 1.3 ppb 1 ppb

ppb

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SLIDE 37

Potential Health Effects: Hexavalent Chromium

  • Hexavalent Chromium is a potent carcinogen

when inhaled

  • Found to cause cancer in rats and mice that were

exposed through drinking water

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SLIDE 38

BAT for Hexavalent Chromium

  • Controls for Hexavalent Chromium include:
  • Ion exchange
  • Coagulat ion/ filt rat ion
  • Reverse osmosis
  • Lime soft ening
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SLIDE 39

Thank you!

Questions?