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	Annual Toxics Summary Chico-East Avenue FAQs Methylene Chloride 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
2024		0.05	0.10	*	0.12	0.13	0.026	15	0.10	*
2023		0.05	0.05	0.074	0.12	0.15	0.033	31	0.10	0.7
2022		0.05	0.05	0.070	0.13	0.15	0.035	30	0.10	0.7
2021		0.05	0.05	*	0.05	0.05	0.000	24	0.10	*
2020		0.05	*	*	*	0.05	0.000	7	0.10	*
2019		0.05	0.05	0.060	0.05	0.37	0.059	30	0.10	0.6
2018		0.05	0.05	0.078	0.14	0.32	0.057	30	0.10	0.8
2017		0.05	0.05	*	0.11	0.27	0.053	20	0.10	*
2016		0.05	0.05	0.085	0.13	0.31	0.055	31	0.10	0.8
2015		0.05	0.05	0.089	0.17	0.17	0.046	30	0.10	0.9
2014		0.05	0.05	0.087	0.14	0.36	0.066	30	0.10	0.9
2013		0.05	0.05	0.078	0.16	0.34	0.065	31	0.10	0.8
2012		0.05	0.05	*	0.11	0.12	0.024	18	0.10	*
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.