Pollution Loads and River Flow to the Chesapeake Bay (1990-2022) ^‍‍

River and Watershed Input of Pollution Loads. Years denote the water year measured between October 1 and September 30. See how these data are used in the Water Quality Standards Attainment and Monitoring Outcome and the Factors Influencing the Submerged Aquatic Vegetation (SAV) Outcome.

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Atmospheric Deposition to Tidal Waters (million pounds)

Downstream Nonpoint Sources (million pounds)

Downstream Wastewater Treatment Plants (million pounds)

River Input (million pounds)

River Flow (billion gallons)

Year	Atmospheric Deposition to Tidal Waters (million pounds)	Downstream Nonpoint Sources (million pounds)	Downstream Wastewater Treatment Plants (million pounds)	River Input (million pounds)	River Flow (billion gallons)
1985	19.4	52.5	69.9	159.0	36.68
1986	19.7	81.6	70.6	238.3	49.93
1987	19.2	75.0	70.2	220.9	49.82
1988	19.0	51.3	65.2	157.1	38.24
1989	25.6	69.2	61.4	206.2	48.90
1990	22.6	66.2	65.2	195.6	48.80
1991	20.0	74.6	61.4	216.9	53.86
1992	20.7	49.9	61.6	149.5	38.46
1993	24.0	96.1	60.5	270.7	65.06
1994	24.8	98.1	59.4	274.9	68.83
1995	21.4	44.3	55.9	133.4	38.13
1996	25.7	125.8	54.7	349.8	73.20
1997	23.1	77.1	49.2	218.6	57.95
1998	22.4	90.2	45.9	251.2	68.62
1999	20.9	30.3	46.9	93.1	29.46
2000	22.5	54.0	44.5	153.6	45.57
2001	21.3	39.5	41.5	116.9	33.82
2002	19.6	26.3	41.0	81.6	29.35
2003	26.0	116.4	40.7	313.1	76.00
2004	20.3	158.8	40.2	413.4	75.94
2005	22.0	89.4	38.0	239.9	56.50
2006	22.3	72.7	36.9	197.7	49.93
2007	18.7	66.6	35.7	184.4	50.74
2008	20.6	61.2	36.1	171.8	48.10
2009	21.1	45.0	34.2	130.7	40.77
2010	17.0	67.1	34.8	187.1	50.90
2011	23.0	123.0	28.1	333.4	72.93
2012	18.6	58.4	26.4	167.5	51.33
2013	17.2	55.4	26.1	158.9	48.74
2014	17.6	71.9	26.4	201.9	52.19
2015	17.5	48.8	25.4	137.1	40.72
2016	17.1	52.5	24.4	146.7	46.10
2017	16.8	51.1	22.7	140.7	47.40
2018	16.6	101.6	21.2	272.8	69.80
2019	16.5	120.6	19.5	326.9	83.70
2020	16.3	56.6	16.6	156.1	50.30
2021	16.2	67.8	18.2	183.6	54.81
2022	16.0	57.7	18.2	160.9	47.18

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