Ecoregion Suspended chlorophyll a, mg L-1 Turbidity, FTU USEPA suggested 25th percentiles USEPA suggested 25th percentiles I 1.80 - 4.25 - II 1.08 - 1.30† - III 1.78 - 2.34 - IV 2.40 1.52 4.21 - V 3.00 6.78 7.83 - VI 2.70 - 6.36 - VII 1.50 - 1.70† 1.70-2.70† VIII 0.63 - 1.30 1.40† IX 0.93 3.47-3.76 5.70 4.00† X 2.10 0.75-4.35 17.50 - XI 1.61 - 2.30† 1.60† XII 0.40 - 1.90† - XIII - - - - XIV 3.75 4.00 3.04 4.50† †turbidity in NTU

Table 2: Stream suspended chlorophyll a and turbidity criteria suggested by USEPA for the fourteen aggregate eco-regions [8] and the25th percentiles reported in the literature [7].

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