United States
    Environmental Protection
              EPA's  BEACH  Report:
              Guam 2011  Swimming  Season
              September 2012
  The Beaches Environmental Assessment and
  Coastal Health (BEACH) Act of 2000 authorizes
  EPA to provide grants to coastal and Great Lakes
  states, territories, and eligible tribes to monitor
  their coastal beaches for bacteria that indicate the
  possible presence of disease-causing pathogens
  and to notify the public when there is a potential
  risk to public health. The BEACH Act requires that
  recipients of those grants report their coastal beach
  monitoring and notification data to EPA. This fact
  sheet highlights the data submitted to EPA by
  Guam for the 2011  swimming season.

  2011 Swimming Season
  Monitoring and Notification
  Guam monitored 31 coastal beaches during the
  2011 swimming season (Figure 1 and Table 1).
  When monitoring results at swimming beaches
  show that levels of specific indicator bacteria in the
  water exceed applicable water quality standards,
  Guam officials issue a beach advisory, warning
  people of possible risks of swimming.

  How many beaches had notification actions?
  In 2011, of the 31 coastal beaches that Guam
  monitored, 29 (94 percent) had at least one
  notification action. This is approximately the same
  as in previous years (Figure 2).
 Figure 1. Guam
Table 1.
Number of monitored and
unmonitored coastal beaches
for 2011.
              Total              Not
             Beaches   Monitored  Monitored


   Figure 2: Percent of beaches with one or
            more notification actions
   Figure 4: Percent of beach days open
            and safe for swimming

   Figure 3: Duration of beach notification
            actions in 2011
                        8-30 days
                                 Over 30 days
    3-7 days
How many notification actions were issued and
how long did they last?
Guam issued 827 notification actions during the
2011 swimming season. Typically Guam lifts an
action when follow-up monitoring indicates that
water quality complies with applicable standards.
For the majority of actions (94 percent) water
quality returned to normal and beaches were
deemed safe for swimming within a week or less
(Figure 3).

What percentage of days were beaches under
a notification action?
EPA calculates the total available beach days and
the number of beach days with notification actions
to better track trends over time. Total available




             M To the Beach)
              To the Beach)




beach days are determined by multiplying the
length of the beach season by the number of
beaches in the state. For 2011 EPA calculated
that 11,315 beach days were associated with the
swimming seasons of the 31 monitored Guam
beaches. Guam reported notification actions on
5,366 days, meaning that beaches were open and
safe for swimming about 53 percent of the time.
This is approximately the same as in previous years
(Figure 4).

For  More Information
For information about the Guam beach program
Anne Leon Guerrero
Environmental Protection Agency
Tel: 671-475-1656
e-mail: annie.leonguerrero@epa.guam.gov
For general information about beaches visit:
For information about a specific beach visit: