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	Annual Toxics Summary El Cajon-Redwood Avenue FAQs Perchloroethylene 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		0.005	0.005	0.009	0.02	0.04	0.008	30	0.01	1
2012		0.005	0.01	0.016	0.03	0.10	0.020	30	0.01	2
2011		0.005	0.005	0.017	0.04	0.07	0.019	31	0.01	2
2010		0.005	0.02	0.027	0.05	0.12	0.025	30	0.01	3
2009		0.005	0.02	0.116	0.11	3.2	0.571	31	0.01	14
2008		0.005	0.02	0.027	0.06	0.08	0.021	30	0.01	3
2007		0.005	0.02	0.036	0.07	0.11	0.029	28	0.01	4
2006		0.005	0.03	0.040	0.09	0.11	0.031	32	0.01	5
2005		0.005	0.03	0.045	0.08	0.14	0.034	28	0.01	5
2004		0.005	0.04	0.043	0.08	0.10	0.025	30	0.01	5
2003		0.01	0.05	0.059	0.10	0.18	0.041	30	0.01	7
2002		0.02	0.05	0.072	0.14	0.50	0.091	29	0.01	8
2001		0.02	0.05	0.065	0.13	0.18	0.045	30	0.01	8
2000		0.03	0.07	0.100	0.23	0.32	0.084	28	0.01	12
1999		0.01	0.14	*	0.24	0.33	0.104	22	0.01	*
1998		0.005	0.05	*	0.24	0.32	0.098	21	0.01	*
1997		0.01	0.14	0.147	0.28	0.46	0.121	26	0.01	17
1996		0.02	0.09	0.168	0.34	0.58	0.149	30	0.01	19
1995		0.04	0.19	0.352	0.55	3.2	0.585	29	0.01	41
1994		0.01	0.20	*	0.52	1.6	0.325	28	0.01	*
1993		0.02	0.19	0.256	0.52	0.89	0.200	28	0.01	30
1992		0.06	0.28	0.319	0.67	0.80	0.222	29	0.01	37
1991		0.04	0.21	0.308	0.47	1.3	0.268	29	0.01	36
1990		0.05	0.28	0.329	0.64	1.1	0.258	31	0.01	38
1989		0.07	0.36	0.431	0.91	1.1	0.323	23	0.01	50

	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.