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	Annual Toxics Summary North Long Beach 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	*	*
2023		*	*	*	*	*	*	0	*	*
2022		*	*	*	*	*	*	0	*	*
2021		*	*	*	*	*	*	0	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		*	*	*	*	*	*	0	*	*
2013		0.005	0.01	*	0.03	0.06	0.015	22	0.01	*
2012		0.005	0.02	0.024	0.05	0.09	0.020	29	0.01	3
2011		0.005	0.02	0.027	0.06	0.11	0.027	30	0.01	3
2010		0.005	0.02	0.032	0.06	0.13	0.028	26	0.01	4
2009		0.005	0.03	0.040	0.09	0.14	0.036	30	0.01	5
2008		0.005	0.03	0.047	0.07	0.50	0.090	30	0.01	5
2007		0.005	0.03	0.041	0.09	0.16	0.037	29	0.01	5
2006		0.01	0.04	0.054	0.10	0.28	0.054	30	0.01	6
2005		0.01	0.03	*	0.11	0.18	0.045	26	0.01	*
2004		0.02	0.04	0.057	0.10	0.17	0.039	31	0.01	7
2003		0.02	0.06	0.076	0.14	0.22	0.050	27	0.01	9
2002		0.02	0.06	0.095	0.20	0.35	0.081	26	0.01	11
2001		0.02	0.08	*	0.25	0.48	0.107	26	0.01	*
2000		0.02	0.10	0.168	0.33	0.52	0.142	28	0.01	19
1999		0.005	0.10	*	0.39	0.79	0.209	16	0.01	*
1998		0.005	0.12	0.193	0.37	1.1	0.222	28	0.01	22
1997		0.02	0.20	0.227	0.47	0.52	0.181	30	0.01	26
1996		0.01	0.16	*	0.52	1.1	0.282	22	0.01	*
1995		0.03	0.20	0.318	0.85	1.6	0.346	31	0.01	37
1994		0.01	0.18	0.321	0.70	1.3	0.335	30	0.01	37
1993		0.01	0.19	0.433	1.2	1.5	0.462	32	0.01	50
1992		0.10	0.28	0.349	0.66	1.2	0.247	30	0.01	40
1991		0.04	0.22	0.355	0.72	1.1	0.292	29	0.01	41
1990		0.09	0.35	0.477	0.81	1.5	0.359	31	0.01	55
1989		0.14	0.31	*	1.3	1.6	0.488	21	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.