I. Safety of the Water that Comes in Contact with Food or FoodContact Surfaces - PowerPoint PPT Presentation

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I. Safety of the Water that Comes in Contact with Food or FoodContact Surfaces

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... pressure (pressure of the non-potable system exceeds the positive pressure in ... a physical connection between a potable (drinkable) water supply and a source of ... – PowerPoint PPT presentation

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Title: I. Safety of the Water that Comes in Contact with Food or FoodContact Surfaces


1
I. Safety of the Water that Comes in Contact with
Food or Food-Contact Surfaces
2
  • Uses for water
  • Washing product
  • Conveying or transporting product
  • Cleaning and sanitizing of equipment and
    facilities
  • As an ingredient
  • Delivery of processing aids
  • Drinking

3
Potential hazards associated with water
  • Contamination of water that comes into contact
    with food with human pathogens
  • Infection of workers with human pathogens who
    then become a source of contamination
  • Contamination of water with hazardous chemicals
    such as pesticides, fertilizers, heavy metals, or
    other potentially harmful compounds.

4
Monitoring goal
  • To provide assurance that water that contacts
    food or food contact surfaces meets EPA National
    Primary Drinking Water Regulations

5
EPA National Primary Drinking Water
Standards http//www.epa.gov/safewater/mcl.html
1Maximum Contaminant Level (MCL) - Highest level
of a contaminant allowed.
6
What to monitor?
  • Municipal water
  • Well water

7
Characteristics of municipal water
  • High chemical and microbiological standards
  • Been purified or treated and
  • Been tested on a pre-determined schedule.

8
Characteristics of well water
  • May be contaminated by floods or heavy rains,
  • Location too close to cesspools, septic tanks,
    agricultural sites, or drainage fields may result
    in contamination and
  • Cracked or improperly sealed well casings or
    liners may cause contamination.

9
Municipal water monitoring
  • Annual water bill
  • Municipal laboratory results optional

10
Well water monitoring
  • Condition of wells
  • Laboratory analysis for indicator microbes (eg.
    coliforms)
  • Frequency specified by local standards or at
    least on a semi-annual basis
  • Before start-up for use in processing

11
Monitoring of in-plant water contamination
  • Cross-connections
  • Backflow
  • Back pressure (pressure of the non-potable system
    exceeds the positive pressure in the water
    distribution lines)
  • Back siphonage (a partial vacuum in a
    water-supply draws water from a contaminated
    source)

12
Cross-connections
  • Stoppage in toilet or sink may allow contaminated
    water to reach water line and exit lower faucet

Back siphonage
(from Katsuyama, 1993
13
Cross-connections
  • a physical connection between a potable
    (drinkable) water supply and a source of
    contamination

http//www.northglenn.org/publicworks/util/cross.h
tm
14
Backflow control
  • Air gap
  • Vacuum breaker
  • Check valve

15
Air Gap
http//www.ci.lincoln.ne.us/city/pworks/water/pic/
dscn0363.jpg
16
Vacuum Breakers
Reduced Pressure
http//www.ci.lincoln.ne.us/city/pworks/water/pic/
dscn0326.jpg
http//www.ci.lincoln.ne.us/city/pworks/water/pic/
dscn0338.jpg
Atmospheric Pressure
17
A single vacuum breaker serving multiple
submerged pipes supplied by a single water line
(from Katsuyama, 1993)
18
Typical corrective actions
  • Observation Well casing cracked
  • Correction Repair well, test water
  • Observation Cross-connection found
  • Correction Make repairs, install vacuum
    breakers or air gap, test water
  • Observation Unacceptable microbial counts
  • Correction Shutdown well, withdraw product
    until safety established, inspect and repair
    well, retest.

19
Records
  • Municipal water
  • Monthly water bill
  • Annual self-audit
  • Well water
  • Results of water testing
  • Corrective actions, Retesting results
  • Annual self-audit
  • Cross connections
  • Monthly checks
  • Repairs and corrections
  • Annual self-audit
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