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	Annual Toxics Summary Calexico-Ethel Street 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		0.005	0.005	*	0.02	0.08	0.017	21	0.01	*
2024		0.005	0.01	0.019	0.03	0.11	0.024	30	0.01	2
2023		0.005	0.005	0.013	0.02	0.06	0.013	30	0.01	2
2022		0.005	0.005	0.014	0.04	0.08	0.018	31	0.01	2
2021		0.005	0.005	*	0.01	0.04	0.007	23	0.01	*
2020		0.005	*	*	*	0.07	0.023	7	0.01	*
2019		0.005	0.005	0.015	0.03	0.07	0.016	28	0.01	2
2018		0.005	0.01	0.017	0.03	0.06	0.013	28	0.01	2
2017		0.005	0.005	0.017	0.04	0.19	0.036	29	0.01	2
2016		0.005	0.01	0.021	0.06	0.11	0.025	30	0.01	2
2015		0.005	0.02	0.026	0.05	0.13	0.030	30	0.01	3
2014		0.005	0.01	0.022	0.04	0.15	0.031	30	0.01	3
2013		0.005	0.01	0.022	0.06	0.15	0.034	31	0.01	3
2012		0.005	0.01	0.034	0.08	0.21	0.048	29	0.01	4
2011		0.005	0.01	0.038	0.07	0.44	0.086	31	0.01	4
2010		0.005	0.02	*	0.08	0.13	0.035	19	0.01	*
2009		0.005	0.01	0.022	0.04	0.12	0.025	31	0.01	3
2008		0.005	0.02	0.037	0.10	0.27	0.059	29	0.01	4
2007		0.005	0.02	0.045	0.12	0.23	0.060	28	0.01	5
2006		0.005	0.03	0.052	0.11	0.37	0.068	31	0.01	6
2005		0.005	0.03	0.064	0.11	0.42	0.100	30	0.01	7
2004		0.005	0.03	0.032	0.06	0.11	0.023	31	0.01	4
2003		0.005	0.04	0.056	0.10	0.29	0.056	30	0.01	7
2002		0.01	0.04	0.058	0.12	0.23	0.056	30	0.01	7
2001		0.005	0.04	0.056	0.12	0.22	0.055	31	0.01	6
2000		0.02	0.06	0.068	0.13	0.17	0.045	31	0.01	8
1999		0.005	0.10	*	0.28	0.31	0.105	21	0.01	*
1998		0.005	0.04	*	0.26	0.35	0.105	26	0.01	*
1997		0.005	0.04	0.098	0.25	0.81	0.159	30	0.01	11
1996		0.005	0.03	0.056	0.15	0.30	0.067	30	0.01	7
1995		0.01	0.06	*	0.26	0.44	0.132	12	0.01	*
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.