Concentrations of contaminants found in stormwater

Concentrations of contaminants found in stormwater. Source: International Stormwater Database Version 3 (Updated 2008).

Link to this table.

Land use	TSS1	NO2 + NO31	TN1	TP1	Cl1, 5	Cu2	Zn2	Ni2	Cd2	Cr2	CN2, 5	Oil and grease2	VOCs2, 5	Pesticides2, 4, 5	FC3, 5	EC3, 5	FS3, 5
Commercial
Number of sites	56	50	13	56	--	60	62	40	51	38	2	44	4	1	4	--	3
Number of observations	857	786	77	948	--	785	867	291	543	294	6	394	160	6	19	--	7
% of samples above detection	98.7	98.9	97.4	94.5	--	85	99.2	51.5	38.1	52.0	0	65.5	65.5	0	73.7	--	100
Minimum	<0.5	<0.1	<1.5	<0.01	--	<0.2	<0.3	<1	<0.03	<0.7	n/a	<0.5	<0.05	n/a	<200	--	310
Maximum	2385	8.2	18.1	4.27	--	569.1	3050.5	110	80	100	n/a	359		n/a	28000	--	24000
Median	52	0.6	1.75	0.2	--	17	110	7	0.94	6	n/a	5	0.7	n/a	450	--	3100
Industrial
Number of sites	58	51	13	57	1	65	67	43	60	42	2	48	3	--	6	--	4
Number of observations	619	536	85	638	10	569	627	300	525	312	9	370	144	--	32	--	12
% samples above detection	99.5	97.0	95.3	95.1	50.0	85.1	98.9	58.0	48.6	72.4	0	59.7	10.4	--	90.6	--	91.7
Minimum	<1	<0.02	<1.5	<0.02	<2	<0.2	<0.5	<2	<0.03	<0.7	n/a	<0.5	<0.05	--	<1	--	<1
Maximum	2490	8.4	15.2	7.9	7.8	1360	8100	120	334	150	n/a	408		--	3600000	--	48000
Median	75	0.68	1.7	0.23	6	19	155	11.5	1.4	10	n/a	5	0.06	--	3950	--	24000
Residential
Number of sites	146	127	20	148	2	147	151	77	114	72	--	95	7	1	10	3	4
Number of observations	2257	1772	131	2380	19	1743	2013	418	1123	408	--	694	210	6	94	19	23
% of sample above detection	99.9	99.0	98.5	98.2	26.3	86.5	97.0	42.2	40.4	48.8	--	56.8	20.1	0	85.9	100	95.7
Minimum	<0.5	<0.03	<1.5	<0.01	<2	<0.2	<0.5	<0.5	<0.03	<0.7	--	<0.5	<0.05	n/a	<1	10	<1
Maximum	4168	66.4	18.3	19.90	18.3	590	14700	100	70	70	--	419	3.42	n/a	5230000	35000	200000
Median	58	0.60	2.24	0.26	5.5	11	69.9	6	0.5	4	--	4	1.1	n/a	9400	1000	23500
Open space
Number of sites	15	13	4	15	--	12	12	9	8	7	3	9	1	--	2	1	--
Number of observations	105	109	13	111	--	44	49	38	41	36	13	26	5	--	6	5	--
% of samples above detection	97.1	92.7	92.3	93.7	--	64.4	65.3	23.1	39.0	36.1	15.4	34.6	60.0	--	100	100	--
Minimum	<1	<0.1	<0.5	<0.01	--	<0.8	<5	<2	<0.04	<0.7	<0.01	<1	<0.2	--	1900	100	--
Maximum	4168	3.4	3.3	0.76	--	210	390	100	8	120	0.08	11	0.84	--	63000	4700	--
Median	58	0.5	1.1	<0.05	--	8.2	26.5	18	0.24	5	0.07	2.12	0.77	--	2150	1100	--

TSS=total suspended solids, NO₂=nitrite, NO₃=nitrate, TN=total nitrogen, Cl=chloride, Cu=copper, Zn=zinc, Ni=nickel, Cd=cadmium, Cr=chromium, CN=cyanide, VOC=volatile organic compound, FC=fecal coliform, EC=E. coli, FS=fecal streptococci ¹ Concentrations are in milligrams per liter
² Concentrations are in micrograms per liter
³ Concentrations are in
⁴Data is for trans-1,3-Dichloropropene and bromomethane
⁵ Data was selected from states with a similar climate to MN. The appropriate states were determined using Figure 1.3 from the Stormwater BMP Design Supplement for Cold Climates document.