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Drinking Water Quality Meeting Water Demand and Water Quality ChallengesEBMUD Perspectives Eileen M.

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Utilities with high quality water sources may be over-regulated because of ... Bottled Water. Central Treatment and Distribution. Summary ... – PowerPoint PPT presentation

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Title: Drinking Water Quality Meeting Water Demand and Water Quality ChallengesEBMUD Perspectives Eileen M.


1
Drinking Water QualityMeeting Water Demand
and Water Quality Challenges-EBMUD
PerspectivesEileen M. White, P.E.Manager of
Water Operations
September 12, 2006
2
from snowmelt to tap
  • EBMUD, a large public community water system,
    provides water service to 20 cities and 15
    communities in two counties
  • 1.3 million customers

3
EBMUDs Service Area
  • 1,300,000 customers
  • 3,944 miles of pipe
  • 126 pumping plants
  • 165 reservoirs/tanks
  • 122 pressure zones
  • Elevation MSL-1,450 ft

4
Meeting Projected Water Demand (2030)281 MGD
5
Water Conservation Program
35 MGD
17.6 MGD saved to date
District Programs 18 MGD goal
Natural Replacement 17 MGD goal
Fiscal Year
_at_ 5 million annual budget
6
EBMUD RECYCLED WATER PROJECTS
7
EBMUD Water System
  • Mokelumne supply
  • Lower treatment cost
  • Excellent water quality
  • More stable disinfection residual
  • Less prone to nitrification
  • East Bay supply
  • Combination of Mokelumne local runoff
  • Higher treatment cost

8
Sierra Snow Melt
  • Snow melt provides 90 of our water source
  • Pristine source allows us to produce superior
    quality water

9
Water Sources
  • Mokelumne River Watershed
  • 577 square mile protected watershed of the
    Mokelumne River which collects snow melt from
    Alpine, Amador and Calaveras counties
  • Supplies up to 325 million gallons of water daily

10
Pardee Dam and Spillway
11
Three Aqueducts
12
Briones Reservoir
13
San Pablo Reservoir
14
General Challenges Facing Utilities
  • Finite traditional good quality water sources
  • Stringent and complex Drinking Water Regulations
  • Maintain/Improve consumer confidence
  • Infrastructure deterioration
  • Infrastructure security
  • Acceptable sustainable rate structure
  • Climatic effects on water supply and quality

15
Issues with Meeting Drinking Water Standards
  • Regulations becoming more complicated to
    implement
  • Challenge of simultaneous compliance of competing
    standards
  • Uncertainty of scientific justification for
    standards, e.g. Arsenic MCL
  • Utilities with high quality water sources may be
    over-regulated because of minimum treatment
    standard

16
General Water Quality Challenges
  • Pathogen Cryptospordium, Giardia, Virus
  • Disinfection-By-Products THMs, HAA, Bromate
  • Inorganics Arsenic, Perchlorate, Lead, Nitrate
  • Organics SOC
  • Potential Emerging Contaminants
  • New/Rediscovered pathogens NDMA/Nitrosamines
  • Endocrine Disruptors
  • EPA UCMR Contaminants
  • Contaminants with PHG or Notification levels

17
Six Water Treatment Plants
  • Three In-Line Treatment Plants
  • Appropriate and efficient for high quality
    supply
  • Three Conventional Treatment Plants
  • Two plants have ozone/peroxide process for taste
    and odor control

18
Water Treatment Plant SchematicFull Treatment
Local Reservoir
X
Clear-wells
Filters
Distribution System
Ozone/ Peroxide
Aeration
Rapid Mix
Flocculation
Sedimentation
19
Four Small Water Systems
  • Pardee Recreation Area Water System
  • 0.3 MGD ultrafiltration membrane
  • Pardee Center Water System
  • 0.1 MG ultrafiltration membrane
  • Camanche Northshore Recreation Area
  • 0.3 MGD groundwater wells
  • Camanche Southshore Recreation Area
  • 0.5 MGD direct-filtration

20
EBMUD Water Treatment Approach
  • EBMUD provides the highest quality water possible
    to our customers
  • Protect the quality of sources so we can more
    easily protect future generations

21
Current Technologies
  • Conventional Filtration
  • Membrane Filtration
  • Enhanced Coagulation
  • Lime Softening
  • Activated Carbon Granular or Powdered
  • Ultraviolet Disinfection
  • Ozone

22
Current Technologies (contd)
  • Mixed Oxidant
  • Chlorine Dioxide
  • Chloramines
  • Corrosion Control Treatment
  • Ion-Exchange/Activated Alumina
  • Reverse Osmosis
  • Biofiltration

23
Emerging Technologies
  • Improvement of membrane technology
  • Coagulation Membrane Filtration, low pressure
    reverse osmosis
  • Improvement of UV technology
  • Mercury-free low-pressure lamp
  • MIEX DOC removal process

24
Water Delivery Alternatives
  • Dual Distribution
  • Point of Use/Point of Entrance Treatment
  • Bottled Water
  • Central Treatment and Distribution

25
Summary
  • Drinking water regulations are becoming more
    stringent and complex to implement
  • Advancing water treatment technology produces
    higher quality drinking water
  • Appropriate treatment technology will depend on
    water quality and specific system conditions
  • Goal is to provide high quality water while
    minimizing cost to customers

26
(No Transcript)
27
Water Quality Data
28
Centralized Treatment vs. Distributed Treatment
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