Benthic Macroinvertebrate Impairments
Freshwater Streams and Rivers Health Assessment
y
Chesapeake Bay Program
A Watershed Partnership
Data Sources: DE: EPA (2004)
MD: MDE (2006)
NY: New York DEC (2006)
PA: Pennsylvania DEP (2006)
VA: Virginia DEQ (2006)
WV: West Virginia DEP (2006)
DC: Data not included
Disciaimer: www.chesapeakebay.netAermsofuse.htm
NOTE: Pie charts are not directly comparable since each state
monitors and assesses benthic macro invertebrates on different
scales with different methodologies and criteria. For more
information on these differences, please refer to:
www. chesapeakebay.n et/statu s_wate rs h ed h ea Ith. as px.
% Not
Assessed,
Legend
„ % Impaired
% Not Impaired
Degraded Benthic
Macroinvertebrate
Community
Virginia
0	25 50	100 Kilometers
1	i i i i	i i i i
I	i i	i I i i i I
0	25	50	100 Miles
Pennsylvania
West
Virginia
Maryland
Delaware
Created by JW, 3/4/08	UTM Zone 18N, NAD 83

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