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	Annual Toxics Summary El Cajon-Redwood Avenue FAQs Methyl Chloroform parts per billion

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
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		0.005	0.005	0.005	0.005	0.01	0.002	30	0.01
2012		0.005	0.005	0.006	0.01	0.01	0.002	30	0.01
2011		0.005	0.005	0.007	0.01	0.01	0.003	31	0.01
2010		0.005	0.01	0.010	0.01	0.02	0.004	30	0.01
2009		0.005	0.01	0.011	0.02	0.02	0.004	31	0.01
2008		0.01	0.01	0.014	0.02	0.03	0.006	30	0.01
2007		0.01	0.01	0.014	0.02	0.02	0.005	28	0.01
2006		0.02	0.02	0.021	0.03	0.03	0.003	32	0.01
2005		0.02	0.02	0.025	0.03	0.04	0.006	28	0.01
2004		0.005	0.03	0.027	0.03	0.04	0.006	29	0.01
2003		0.02	0.04	0.035	0.04	0.05	0.006	30	0.01
2002		0.03	0.04	0.046	0.06	0.06	0.009	29	0.01
2001		0.04	0.05	0.049	0.06	0.07	0.008	30	0.01
2000		0.05	0.06	0.074	0.10	0.16	0.026	27	0.01
1999		0.05	0.09	*	0.12	0.13	0.023	14	0.01
1998		0.03	0.06	*	0.10	0.18	0.034	20	0.01
1997		0.05	0.09	0.126	0.18	0.62	0.110	26	0.01
1996		0.06	0.14	0.280	0.39	1.3	0.268	30	0.01
1995		0.14	0.26	0.341	0.59	1.2	0.253	29	0.01
1994		0.07	0.38	*	1.16	3.1	0.619	28	0.01
1993		0.13	0.49	0.884	1.74	3.4	0.721	27	0.01
1992		0.35	0.84	1.36	2.24	11	1.99	29	0.01
1991		0.38	0.84	1.53	2.36	11	2.07	28	0.01
1990		0.24	0.85	0.935	1.6	3.8	0.690	31	0.01
1989		0.17	0.95	1.30	2.16	6.1	1.29	22	0.01

	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.