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	Annual Toxics Summary Chula Vista 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
2024		0.005	0.005	*	0.01	0.02	0.004	17	0.01	*
2023		0.005	0.005	0.007	0.01	0.02	0.004	31	0.01	0.9
2022		0.005	0.005	0.007	0.01	0.02	0.003	30	0.01	0.8
2021		0.005	0.005	*	0.02	0.06	0.012	23	0.01	*
2020		0.005	*	*	*	0.02	0.005	9	0.01	*
2019		0.005	0.005	0.008	0.01	0.06	0.009	29	0.01	0.9
2018		0.005	0.005	0.008	0.02	0.03	0.007	31	0.01	1
2017		0.005	0.005	0.006	0.01	0.02	0.003	29	0.01	0.7
2016		0.005	0.005	0.012	0.02	0.06	0.012	30	0.01	1
2015		0.005	0.01	0.016	0.03	0.07	0.014	31	0.01	2
2014		0.005	0.01	0.010	0.02	0.03	0.006	29	0.01	1
2013		0.005	0.005	0.011	0.02	0.04	0.008	30	0.01	1
2012		0.005	0.01	0.011	0.02	0.03	0.007	30	0.01	1
2011		0.005	0.005	0.011	0.02	0.04	0.008	31	0.01	1
2010		0.005	0.01	0.018	0.04	0.07	0.017	30	0.01	2
2009		0.005	0.02	0.021	0.04	0.07	0.019	32	0.01	2
2008		0.005	0.02	0.021	0.05	0.07	0.017	30	0.01	2
2007		0.005	0.02	0.025	0.06	0.11	0.026	31	0.01	3
2006		0.005	0.02	*	0.09	0.14	0.037	26	0.01	*
2005		0.005	0.03	0.036	0.07	0.13	0.030	29	0.01	4
2004		0.005	0.03	0.031	0.04	0.08	0.015	31	0.01	4
2003		0.01	0.03	*	0.05	0.09	0.020	28	0.01	*
2002		0.005	0.04	0.048	0.08	0.19	0.039	31	0.01	6
2001		0.01	0.05	0.057	0.09	0.29	0.054	30	0.01	7
2000		0.01	0.06	0.078	0.17	0.32	0.074	29	0.01	9
1999		0.005	0.07	*	0.19	0.22	0.075	17	0.01	*
1998		0.005	0.05	*	0.17	0.27	0.069	25	0.01	*
1997		0.01	0.08	0.103	0.25	0.39	0.097	29	0.01	12
1996		0.02	0.10	*	0.23	0.45	0.102	26	0.01	*
1995		0.02	0.12	0.146	0.36	0.54	0.133	29	0.01	17
1994		0.005	0.07	0.132	0.28	0.51	0.121	31	0.01	15
1993		0.02	0.12	0.144	0.23	0.53	0.109	31	0.01	17
1992		0.06	0.19	0.208	0.35	0.65	0.130	30	0.01	24
1991		0.06	0.19	0.229	0.42	0.53	0.129	30	0.01	27
1990		0.08	0.23	0.236	0.41	0.48	0.107	31	0.01	27
1989		0.08	0.30	1.90	0.53	14	3.67	25	0.01	221

	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.