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City of Newport News
Chesapeake Bay TMDL Action Plan
(2024-2029 MS4 Permit Cycle)
Table 2-1. MS4 Service Area
Land Cover Description Acreage
City of Newport News Total 36,954.03
Excluded VPDES/MS4 Permittees 3,387.93
Excluded Open Water 933.62
Excluded Wetlands 1,557.30
Excluded Forests 4,996.02
Excluded Direct Runoff 1,336.09
Excluded Total 12,210.96
Regulated Urban Impervious 9,808.92
Regulated Urban Pervious 14,934.15
Total MS4 Regulated Area 24,743.07
The regulated urban impervious and the regulated urban pervious acreage values were inserted into the
calculations provided by Section I.D. (Tables 1a and 1b) of the MS4 Permit to calculate the required
reductions. During the first permit cycle, the City was required to reduce POC loadings by 5.75%, which
was an accelerated reduction; most MS4 permittees were required to reduce loadings by just 5% during
the first permit term. That extra reduction conservatively accounted for all new sources of
development/redevelopment and grandfathered projects that initiated construction after July 1, 2009.
The same methodology has been applied to the 40% and 100% reduction requirements, so that by June
30, 2026, the City will reduce Total Nitrogen and Total Phosphorus by 40.75%, and 100.75% by June 30,
2028.
Table 2-2 below includes all required POC reductions over all three phases.
Table 2-2. POC Reductions Required for Chesapeake Bay TMDL Compliance
First Permit 40.75% 100.75%
Total Existing
Cycle 5.75% Reduction Reduction
Acres Served
Sub-source Pollutant Reduction Required Required
by MS4
Required (lbs/yr) by June (lbs/yr) by June
(6/30/09)
(lbs/yr) 30, 2026 30, 2028
Regulated Urban
9,808.92
Impervious
Nitrogen 838.63 5,930.31 14,584.89
Regulated Urban
14,934.15
Pervious
Regulated Urban
9,808.92
Impervious
Phosphorus 192.07 1,346.20 3,328.33
Regulated Urban
14,934.15
Pervious
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