Concepto	Unidades	1990	1995	2000	2005	2006	2007	2008	2009	2010	2011	2012	2013
Estación de medición
Nombre		Catemaco	Catemaco	Catemaco	Catemaco	Catemaco	Catemaco	Catemaco	Catemaco	Catemaco	Catemaco	Catemaco	Catemaco
Frecuencia de muestreo anual	Número	8	11	2	3	2	2	1	1	2	1	1	2
Parámetros (promedio anual)
Temperatura	°C	26.14	26	27.3	28.2	32.15	28.2	29.2	26.18	25.8	30.2	nd	26.25
Acidez	pH	7.67	7.40	7.25	8	7.95	8.01	8.31	8.76	8.08	8.6	7.34	8.27
Oxígeno disuelto	mg O2 / l	7.52	7.35	7.59	7.13	8.3	7.42	5.11	nd	6.19	5.6	5.87	4.34
Saturación de oxígeno	%	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	71.2	69.7
DBO (20°C 5d)	mg O2/ l	3.49	4.2	2.43	3	3.04	7.92	5.56	<5	<5.0	<5.0	3.1	4.5
DQO (K2Cr2O7)	mg O2/ l	22.5	26.1	55.5	32.67	35.5	17.62	15.44	16.76	16.27	13.79	16.64	27.78
Sólidos suspendidos	mg/ l	9	16	93	57	43.5	10.84	10	12	10.34	10.63	<10	<10
Sólidos disueltos	mg/ l	nd	88.8	565	554.33	654.5	76.17	76	70	91.67	79.37	72.96	89.6
Nitrógeno total	mg N/ l	nd	nd	nd	nd	nd	nd	1.49	nd	nd	nd	2	0.59
Nitratos	mg NO3/ l	0.08	0.04	0.22	0.36	0.26	1.93	0.71	0.66	<0.09	<0.09	nd	0.075
Amonio	mg NH4/ l	nd	0.719	0.04	nd	nd	<1	<1	<1	2.8	<1.0	<0.39	0.034
Fósforo total	mg P/ l	nd	nd	0.07	0.097	0.145	nd	nd	<0.09	<0.13	nd	<0.049	0.046
Ortofosfatos	mg P/ l	nd	0.008	0.055	nd	nd	nd	<0.09	<0.09	<0.15	<0.08	<0.13	0.021
Clorofila (en verano)	mg /m3	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	26.79
Coliformes fecales	NMP/100 ml	305	836	nd	353	167	250	90	230	40	nd	4	52
Arsénico total	mg As/ l	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	<0.00012	<0.0001
Cadmio total	mg Cd/ l	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	<0.00004	<0.00004
Cromo total	mg Cr/ l	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	<0.0016	0.005
Plomo total	mg Pb/ l	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	<0.1893	<0.00005
Mercurio total	mg Hg/ l	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	0.00015	0.0025
Níquel total	mg Ni/ l	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	0.00037	<0.0007
Notas:
Ubicación geográfica de la estación de medición: 18° 24' 53'' lat. N; 95° 05' 08'' long. W.
nd. No disponible
Fuente:
Comisión Nacional del Agua, Gerencia de Calidad del Agua, Febrero 2015