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	Annual Toxics Summary El Cajon-Redwood Avenue FAQs Methyl tertiary-Butyl Ether 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
2025		*	*	*	*	*	*	0	*	*
2024		*	*	*	*	*	*	0	*	*
2023		*	*	*	*	*	*	0	*	*
2022		*	*	*	*	*	*	0	*	*
2021		*	*	*	*	*	*	0	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		*	*	*	*	*	*	0	*	*
2013		*	*	*	*	*	*	0	*	*
2012		*	*	*	*	*	*	0	*	*
2011		*	*	*	*	*	*	0	*	*
2010		*	*	*	*	*	*	0	*	*
2009		*	*	*	*	*	*	0	*	*
2008		*	*	*	*	*	*	0	*	*
2007		*	*	*	*	*	*	0	*	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		0.15	*	*	*	0.15	0.00	8	0.3	*
2003		0.15	0.4	0.71	1.3	3.1	0.70	30	0.3	4
2002		0.4	1.3	1.77	3.4	5.2	1.30	28	0.3	9
2001		0.4	1.3	1.78	4.0	5.0	1.32	30	0.3	9
2000		0.5	1.4	2.09	3.9	7.1	1.71	29	0.3	11
1999		0.5	1.7	*	5.1	7.4	1.98	27	0.3	*
1998		0.6	1.4	*	5.2	6.1	1.67	25	0.3	*
1997		0.5	2.7	*	6.2	9.1	2.14	20	0.3	*
1996		0.4	1.7	*	3.0	6.1	1.25	20	0.3	*
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.