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	Annual Toxics Summary Modesto-14th 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	*	*
2024		*	*	*	*	*	*	0	*	*
2023		*	*	*	*	*	*	0	*	*
2022		*	*	*	*	*	*	0	*	*
2021		*	*	*	*	*	*	0	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		*	*	*	*	*	*	0	*	*
2013		*	*	*	*	*	*	0	*	*
2012		*	*	*	*	*	*	0	*	*
2011		*	*	*	*	*	*	0	*	*
2010		*	*	*	*	*	*	0	*	*
2009		*	*	*	*	*	*	0	*	*
2008		*	*	*	*	*	*	0	*	*
2007		*	*	*	*	*	*	0	*	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		*	*	*	*	*	*	0	*	*
2002		*	*	*	*	*	*	0	*	*
2001		*	*	*	*	*	*	0	*	*
2000		*	*	*	*	*	*	0	*	*
1999		0.005	0.03	*	0.08	0.11	0.029	16	0.01	*
1998		0.005	0.02	0.035	0.07	0.21	0.042	29	0.01	4
1997		0.005	0.03	0.052	0.09	0.30	0.064	29	0.01	6
1996		0.01	0.03	0.044	0.08	0.22	0.042	31	0.01	5
1995		0.01	0.03	0.053	0.10	0.23	0.053	30	0.01	6
1994		0.005	0.04	0.087	0.22	1.1	0.198	31	0.01	10
1993		0.02	0.05	0.109	0.24	0.85	0.178	30	0.01	13
1992		0.03	0.09	0.118	0.19	0.79	0.140	31	0.01	14
1991		0.02	0.08	0.150	0.25	0.87	0.173	30	0.01	17
1990		0.04	0.12	0.145	0.29	0.37	0.097	31	0.01	17
1989		0.04	0.14	0.158	0.30	0.44	0.103	25	0.01	18

	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.