Hayward water system public health goal report
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Hayward Water System Public Health Goal Report. Alex Ameri, Deputy Director of Public Works Utilities Division Department of Public Works. Water Quality Standards. Public Health Goal Report. Two sets of water quality measures have been established by regulatory agencies:

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Hayward water system public health goal report

Hayward Water SystemPublic Health Goal Report

Alex Ameri, Deputy Director of Public Works

Utilities Division

Department of Public Works


Water quality standards
Water Quality Standards

Public Health Goal Report

  • Two sets of water quality measures have been established by regulatory agencies:

    • Maximum Contaminant Levels (MCLs) – regulatory standards to determine compliance with health and safety requirements

    • Public Health Goals (PHGs)/Maximum Contaminant Level Goals (MCLGs) – health risk-based targets


What are maximum contaminant levels
What are Maximum Contaminant Levels?

Public Health Goal Report

Established by California Department of Health for regulated constituents

Enforceable standards, above which water systems must take specific corrective actions

Set at levels that protect the public from all but a negligible risk and are achievable with current technology

Hayward Water System typically meets all MCLs


What are public health goals
What are Public Health Goals?

Public Health Goal Report

Set by the California Environmental Protection Agency

Federal equivalents, set by US Environmental Protection Agency, are known as Maximum Contaminant Level Goals (MCLGs)

Non-enforceable contaminant levels based solely on health risk considerations

Technological and economic feasibility of achieving goals is not considered

“Ideal” level for health protection


Public health goal report
Public Health Goal Report

Public Health Goal Report

Required by California Health and Safety Code every three years if PHG or MCLG has been exceeded in three prior years

Content and timing prescribed by the Code

  • Prepared in addition to annual Water Quality Report

    Must include:

  • Health risk assessment

  • Discussion of best available technology

  • Cost of treating water to PHG level


Public health goal exceedance
Public Health Goal Exceedance

Public Health Goal Report

One constituent, total coliform, was detected above the applicable PHG during the past three years

Total coliform levels did not exceed MCL in this period

Report has been prepared in accordance with Health and Safety Code requirements

Code requires a public hearing for governing body to receive report and public comments


What is total coliform
What is Total Coliform?

Public Health Goal Report

Widely present in the environment

No health risks have been identified with total coliform

Indicator that other, potentially harmful bacteria may be present

Presence of coliform requires follow-up sampling to ensure that other bacteria is not in the system

Measured as a “percent positive” value

MCL is that no more than 5% of samples collected can be positive

MCLG is effectively zero percent positive


Coliform sampling results
Coliform Sampling Results

Public Health Goal Report

4800 samples collected from distribution system during past three years (2007 – 2009)

25 samples (0.5%) were positive

MCLG of zero percent positive samples was exceeded in 12 of 36 months

Repeat samples, taken within 24 hours, were all negative

MCL of 5% (about 6 positive samples each month) was never exceeded


Health risks treatment technologies
Health Risks & Treatment Technologies

Public Health Goal Report

No specific health risk identified with coliform – indicator only of other potential pathogens

All best available technology and treatment techniques are already in place

Other useful measures, such as cross-connection control and water main flushing, are also part of normal operations

Higher disinfectant levels could lower the incidence of coliform, but would increase disinfectant byproduct levels, some of which could have adverse health impacts – thus not recommended


Next steps
Next Steps

Public Health Goal Report

Conduct public hearing

Adopt resolution indicating that Council has reviewed the report and received public comments, and has directed staff to inform the California Department of Public Health of these actions

Staff will continue to implement appropriate operation and maintenance activities and to monitor coliform levels


Hayward water system public health goal report1

Hayward Water SystemPublic Health Goal Report

Alex Ameri, Deputy Director of Public Works

Utilities Division

Department of Public Works


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