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	Annual Toxics Summary Chico-East Avenue FAQs Trichloroethylene parts per billion

Read About Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
2023		0.01	0.01	*	0.01	0.01	0.000	21	0.02	*
2022		0.01	0.01	0.010	0.01	0.01	0.000	30	0.02	0.3
2021		0.01	0.01	*	0.01	0.01	0.000	24	0.02	*
2020		0.01	*	*	*	0.01	0.000	7	0.02	*
2019		0.01	0.01	0.010	0.01	0.01	0.000	30	0.02	0.3
2018		0.01	0.01	0.010	0.01	0.01	0.000	30	0.02	0.3
2017		0.01	0.01	*	0.01	0.01	0.000	20	0.02	*
2016		0.01	0.01	0.011	0.01	0.03	0.005	30	0.02	0.3
2015		0.01	0.01	0.011	0.01	0.04	0.006	30	0.02	0.4
2014		0.01	0.01	0.011	0.01	0.02	0.002	30	0.02	0.3
2013		0.01	0.01	0.010	0.01	0.01	0.000	31	0.02	0.3
2012		0.01	0.01	*	0.01	0.01	0.000	18	0.02	*
2011		*	*	*	*	*	*	0	*	*
2010		*	*	*	*	*	*	0	*	*
2009		*	*	*	*	*	*	0	*	*
2008		*	*	*	*	*	*	0	*	*
2007		*	*	*	*	*	*	0	*	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		*	*	*	*	*	*	0	*	*
2002		*	*	*	*	*	*	0	*	*
2001		*	*	*	*	*	*	0	*	*
2000		*	*	*	*	*	*	0	*	*
1999		*	*	*	*	*	*	0	*	*
1998		*	*	*	*	*	*	0	*	*
1997		*	*	*	*	*	*	0	*	*
1996		*	*	*	*	*	*	0	*	*
1995		*	*	*	*	*	*	0	*	*
1994		*	*	*	*	*	*	0	*	*
1993		*	*	*	*	*	*	0	*	*
1992		*	*	*	*	*	*	0	*	*
1991		*	*	*	*	*	*	0	*	*
1990		*	*	*	*	*	*	0	*	*
1989		*	*	*	*	*	*	0	*	*

	Notes:	Values below the Limit of Detection (LoD) assumed to be ½ LoD. Means and risks shown only for years with data in all 12 months. "*" means there was insufficient or no data available to determine the value.