NATIONAL
ESTUARY
PROGRAM
BACTERIAL MONITORING AND WATER QUALITY STANDARDS <>EPA
Tillamook Bay—Oregon's third largest estuary—supports a thriving commercial and recreational shellfishing industry. Unfortunately, bacteria concen-
trations found in all five of the Bay's major tributaries routinely violate state and Federal water quality standards, threatening human health and causing
commercial harvest area closures.
As is often the case in estuaries across the country, Tillamook Estuaries Partnership (TEP) knew bacteria came from a combination of point and non-point sources including agri-
cultural runoff, failing septic systems, overloaded municipal treatment plants, and urban stormwater. The tricky part was identifying exactly where these sources were delivering
the largest loads and quantifying how much bacteria was threatening the Bay's health.
THE NATIONAL ESTUARY PROGRAM IN ACTION Tillamook Estuaries Partnership
With its Comprehensive Conser-
vation and Management Plan
(CCMP) serving as a guide, the
TEP launched an ambitious bac-
teria research and monitoring
effort in the basin.
Data produced from this effort
has allowed TEP to apply mitiga-
tion efforts exactly where they
are needed in order to efficiently
and effectively achieve water
quality goals. In addition, bacte-
ria data collected through TEP's
monitoring was also used by the
State of Oregon to create the
Tillamook Bay Bacteria Total
Maximum Daily Load (TMDL).
TEP began its monitoring pro-
gram in 1996, launching an ex-
tensive Storm-Based Monitoring
Program to identify and evaluate
bacterial concentrations attrib-
utable to the watershed's differ-
ent land uses. The effort also
identified suitable long-term
sampling sites for tracking the
status and trends of bacteria
throughout specific river reach-
es. A small team of dedicated
volunteers joined the effort the
following year, and 13,000 sam-
ples later, the TEP reported sig-
nificant progress in 2007. TEP's
trend data has led to some im-
portant discoveries, including
the determination that forested
areas of the watershed generally
meet water quality standards for
bacteria, indicating that forest
wildlife is not a key contributor
of bacterial contamination as
some thought.
Working with Oregon State Uni-
versity researchers in 2001, the
TEP began a three-year genetic
marker study in the Tillamook
Bay Watershed. The study en-
abled scientists to discriminate
among bacteria from human and
ruminant sources. Ruminant
sources include cows, elk, and
deer. Through the analysis, they
EFFECTIVE
EFFICIENT
ADAPTIVE
COLLABORATIVE
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found widespread contamination
from farm animal waste in spe-
cific segments of the river and
high concentrations of human
waste in other parts. Using the
data, watershed managers can
now build the best strategies for
decreasing fecal pollution indi-
cators in specific areas.
The TEP is working with agricul-
tural landowners, including the
local dairy cooperative, which
made some important improve-
ments to its discharge system so
that its effluent no longer dis-
charges directly into the Wilson
River. With a credible, scientific
framework the TEP has devel-
oped partnerships with local
municipalities on habitat resto-
ration and stormwater manage-
ment projects. Additionally, TEP
provides assistance to small
landowners by helping to re-
vegetate riparian areas on their
property, and offers workshops
and other educational opportuni-
ties about the importance of ri-
parian owners and, for agricul-
tural purposes, fencing off
riparian areas to prevent live-
stock from entering streams and
rivers. While the lower sections
of four of the key rivers in the
Tillamook Bay watershed still
violate Oregon's water quality
standards for recreational use,
the fifth tributary, the Wilson
River, has been in compliance
since 2005, and statistically sig-
nificant trends indicate that bac-
teria concentrations remain on a
steady decline.
More than a decade's worth of
status and trend information is
paying off for the TEP with tar-
geted approaches that support
successful, efficient implemen-
tation of the Comprehensive
Conservation and Management
Plan. Investing in efforts that
strategically target land uses
that contribute to surface water
bacteria is bringing the Tillamook
Bay watershed closer to coming
into compliance with state and
Federal water quality standards.
Visit www.tbnep.org to learn
more about this and other TNEP
efforts.
EPA's National Estuary Program
(NEP) is a unique and successful
coastal watershed-based program
established in 1987 under the
Clean Water Act Amendments.
The NEP involves the public and
collaborates with partners to pro-
tect, restore, and maintain the wa-
ter quality and ecological integrity
of 28 estuaries of national signifi-
cance located in 18 coastal states
and Puerto Rico.
For more information about the
NEP go to www.epa.gov/owow/
estuaries.
The NEP: Implementing the Clean Water Act in ways that are Effective, Efficient, Adaptive, and Collaborative.
EPA-842F09001
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