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environmental information > river & stream WQ monitoring > state network >

Water quality monitoring station

45A070 - Wenatchee R @ Wenatchee

Results that exceed water quality criteria or the usual range of data (since October, 1996)

Results that exceeded water quality standards criteria

The Department of Ecology places limits on how much pollution is allowed in our rivers to protect public health and enjoyment, and to support fish, shellfish, and wildlife (WAC 173-201A). Individual results for temperature, pH, oxygen, fecal coliform bacteria, and metals (where sampled) that are higher than these criteria are listed below. (The standards do not contain criteria for other types of water quality constituents.) This table includes only results from our monthly monitoring program. Results from other monitoring, such as continuous monitoring for temperature, are not evaluated here.

Exceeding a criterion does not necessarily mean the water quality standard has been violated. Often, other �pollution� conditions must exist for a stream segment to be in violation of water quality standards. In some cases, standards require that the source of pollution be human activities rather than natural causes. Also, more than a single result exceeding a criterion may be required.

Washington's Water Quality Standards were amended in November, 2006. Data in the tables below are based on the older standards through 2008. Data collected after 2008 are based on the ammended standards, excluding supplemental temperature criteria. We are currently working on incorporating supplemental temperature criteria into our evaluation procedures.

date	time	units	criterion	result	remark	% exceed
pH
9/10/2008	13:48	pH	8.5	8.8		4
4/16/2008	12:35	pH	8.5	8.8		4
3/19/2008	13:00	pH	8.5	8.6		1
10/10/2007	14:25	pH	8.5	8.7		2
8/15/2007	12:19	pH	8.5	8.7	J	2
9/12/2005	12:59	pH	8.5	8.7		3
4/4/2005	11:29	pH	8.5	9		6
3/8/2004	13:10	pH	8.5	8.6		2
10/6/2003	13:13	pH	8.5	9		5
9/8/2003	15:45	pH	8.5	9		6
4/7/2003	15:45	pH	8.5	8.6		1
10/7/2002	14:31	pH	8.5	9		5
9/4/2001	14:25	pH	8.5	8.8		4
8/14/2001	14:25	pH	8.5	8.9		5
5/8/2001	14:45	pH	8.5	8.7		2
3/6/2001	14:39	pH	8.5	8.7		2
9/4/2000	16:50	pH	8.5	9.4		10
8/14/2000	15:40	pH	8.5	8.8		4
4/3/2000	16:25	pH	8.5	8.8		4
3/6/2000	14:30	pH	8.5	8.7		2
10/4/1999	15:50	pH	8.5	8.9		5
9/6/1999	17:40	pH	8.5	8.8		4
4/12/1999	14:35	pH	8.5	9.1		7
3/15/1999	16:05	pH	8.5	8.7		2
11/2/1998	15:10	pH	8.5	9.4		11
9/7/1998	15:30	pH	8.5	8.9		5
4/6/1998	15:45	pH	8.5	9		6
10/13/1997	12:50	pH	8.5	9		6
9/15/1997	12:15	pH	8.5	8.8		4
4/14/1997	14:20	pH	8.5	8.8		4
3/10/1997	14:40	pH	8.5	8.6		1
11/11/1996	15:00	pH	8.5	8.7		2
Temperature
date	time	units	criterion	result	remark	% exceed
9/14/2009	09:49	deg C	17.5	17.8		2
8/12/2009	11:47	deg C	17.5	18.6		6
8/13/2008	12:01	deg C	18	18.6		3
8/15/2007	12:19	deg C	18	19.7		9
8/1/2005	10:35	deg C	18	21.6		20
8/2/2004	11:15	deg C	18	21.1		17
7/12/2004	14:22	deg C	18	19.3		7
9/8/2003	15:45	deg C	18	18.4		2
8/4/2003	14:30	deg C	18	21.3		18
7/7/2003	16:47	deg C	18	18.3		2
9/4/2001	14:25	deg C	18	20.3		13
8/14/2001	14:25	deg C	18	23.8		32
7/10/2001	13:00	deg C	18	20.6		14
9/7/1998	15:30	deg C	18	21.4		19
8/10/1998	15:50	deg C	18	21		17
7/13/1998	16:00	deg C	18	20		11
Zinc, Dissolved
date	time	units	criterion	result	remark	% exceed
8/10/1998	16:00	ug/L	36.93394	39.4		7

Results that contrast strongly with historical data

Results exceeding the usual range of data (defined as 2 standard deviations beyond the mean value for a station based on data from the same three-month period over the previous six years) are shown below. A certain percentage of results will always be listed in this report. Inclusion here does not necessarily indicate something unique is occurring in the watershed.

date	time	units	result	remark	QMEAN	QSD	QDP
Alkalinity
4/16/2008	12:35	mg/L	36		18.27143	5.719765	7
Ammonia-Nitrogen
date	time	units	result	remark	QMEAN	QSD	QDP
12/13/2006	10:20	mg/L	0.032		1.155556E-02	6.599663E-03	18
6/6/2005	10:55	mg/L	0.056		1.105556E-02	3.076901E-03	18
3/6/2001	14:39	mg/L	0.018		0.011	0.002	15
10/4/1999	15:50	mg/L	0.038		0.01	0.001	17
9/6/1999	17:40	mg/L	0.038		0.011	0.002	18
7/5/1999	16:50	mg/L	0.026		0.011	0.002	18
6/14/1999	18:00	mg/L	0.02		0.011	0.002	18
5/10/1999	15:15	mg/L	0.019		0.011	0.002	18
5/12/1997	13:00	mg/L	0.016		0.011	0.002	18
4/14/1997	14:20	mg/L	0.018		0.011	0.002	18
Barometric Pressure
date	time	units	result	remark	QMEAN	QSD	QDP
9/14/2009	09:49	mm/Hg	740.918		747.3577	2.560462	17
3/4/2009	11:35	mm/Hg	717.55		752.0234	6.935754	18
12/2/2002	12:45	mm/Hg	726.694	J	745.29	7.443148	18
11/4/2002	12:50	mm/Hg	722.63	J	745.29	7.443148	18
10/7/2002	14:31	mm/Hg	721.106		745.29	7.443148	18
5/8/2002	10:15	mm/Hg	752.094	J	738.5823	4.760783	18
4/3/2002	09:25	mm/Hg	750.062		738.5823	4.760783	18
Conductivity
date	time	units	result	remark	QMEAN	QSD	QDP
4/14/2009	09:50	umhos/cm	83		48.88889	16.87981	18
4/10/2006	10:13	umhos/cm	88		49.77778	18.16446	18
9/12/2005	12:59	umhos/cm	104		57.11111	18.10716	18
10/10/2001	10:15	umhos/cm	121		71	18.918	17
3/6/2001	14:39	umhos/cm	104		71.067	15.42	15
4/12/1999	14:35	umhos/cm	91		48	19.879	18
3/15/1999	16:05	umhos/cm	108		71.067	15.42	15
10/12/1998	14:10	umhos/cm	110		71	18.918	17
Fecal Coliform Bacteria
date	time	units	result	remark	QMEAN	QSD	QDP
9/14/2009	09:49	#/100ml	140		16.16667	10.26272	18
10/7/2008	09:05	#/100ml	60		12.88889	14.62025	18
2/5/2007	10:44	#/100ml	38		8	12.32883	16
10/3/2005	10:10	#/100ml	67		6.833333	5.436803	18
11/1/2004	11:05	#/100ml	20		6.5	5.512019	18
9/13/2004	11:50	#/100ml	43		11.16667	8.899769	18
11/14/2001	09:43	#/100ml	22	J	4.353	3.856	17
4/12/1999	14:35	#/100ml	54		12.765	13.868	17
10/12/1998	14:10	#/100ml	13		4.353	3.856	17
10/14/1996	15:00	#/100ml	14		4.353	3.856	17
Flow
date	time	units	result	remark	QMEAN	QSD	QDP
8/1/1999	18:40	CFS	6410		1601.333	1764.54	15
7/5/1999	16:50	CFS	7890		1601.333	1764.54	15
6/14/1999	18:00	CFS	14800		6162.333	3031.571	15
7/14/1997	12:40	CFS	7180		1601.333	1764.54	15
6/9/1997	15:35	CFS	12800		6162.333	3031.571	15
5/12/1997	13:00	CFS	13700		6162.333	3031.571	15
Nitrate+Nitrite-Nitrogen
date	time	units	result	remark	QMEAN	QSD	QDP
4/14/2009	09:50	mg/L	0.01	U	4.672222E-02	1.532704E-02	18
2/19/2008	14:52	mg/L	0.186		0.1174444	3.344394E-02	18
1/9/2008	13:15	mg/L	0.193		0.1174444	3.344394E-02	18
9/11/2007	11:12	mg/L	0.301		0.1206111	6.083163E-02	18
3/8/2004	13:10	mg/L	0.059		0.1523333	4.538982E-02	18
Nitrate-Nitrite
date	time	units	result	remark	QMEAN	QSD	QDP
4/12/1999	14:35	mg/L	0.4		0.063	0.027	18
4/14/1997	14:20	mg/L	0.127		0.063	0.027	18
Oxygen
date	time	units	result	remark	QMEAN	QSD	QDP
10/7/2008	09:05	mg/L	10.5		13.21611	1.128811	18
4/4/2005	11:29	mg/L	14.4		12.35833	0.9263417	18
1/6/2003	14:50	mg/L	15.8		14.07294	0.8272678	17
11/4/2002	12:50	mg/L	16		12.99889	0.9936143	18
4/3/2001	13:05	mg/L	13.8		11.761	0.958	18
4/12/1999	14:35	mg/L	14.2		11.761	0.958	18
2/1/1999	17:00	mg/L	16		13.687	0.826	15
1/12/1998	12:20	mg/L	15.7		13.687	0.826	15
pH
date	time	units	result	remark	QMEAN	QSD	QDP
4/16/2008	12:35	pH	8.8		7.919445	0.4410878	18
3/19/2008	13:00	pH	8.6		7.926667	0.3423277	18
7/10/2002	09:45	pH	7.3		8.401111	0.5091387	18
12/5/2001	09:45	pH	7		8.307	0.633	15
9/4/2000	16:50	pH	9.4		8.244	0.463	18
4/12/1999	14:35	pH	9.1		7.782	0.538	17
4/6/1998	15:45	pH	9		7.782	0.538	17
Phosphorus, Sol Reactive
date	time	units	result	remark	QMEAN	QSD	QDP
6/3/2009	09:32	mg/L	0.0037		3.144444E-03	2.381849E-04	18
5/12/2009	10:40	mg/L	0.0037		3.144444E-03	2.381849E-04	18
10/9/2006	11:05	mg/L	0.015		5.638889E-03	2.321546E-03	18
9/8/2003	15:45	mg/L	0.0034		4.722222E-03	6.503895E-04	18
12/2/2002	12:45	mg/L	0.0087		5.244445E-03	1.595295E-03	18
11/4/2002	12:50	mg/L	0.013		5.244445E-03	1.595295E-03	18
9/11/2002	10:15	mg/L	0.0033		0.005	7.529297E-11	18
8/7/2002	11:25	mg/L	0.0037		0.005	7.529297E-11	18
7/10/2002	09:45	mg/L	0.003	U	0.005	7.529297E-11	18
2/6/2002	10:30	mg/L	0.0036	J	0.008	0.002	14
1/9/2002	09:10	mg/L	0.0032		0.008	0.002	14
4/12/1999	14:35	mg/L	0.022		0.007	0.003	17
3/15/1999	16:05	mg/L	0.018		0.008	0.002	14
Phosphorus, Total
date	time	units	result	remark	QMEAN	QSD	QDP
4/7/2003	15:45	mg/L	0.012		0.422421	3.060672E-02	19
12/2/2002	12:45	mg/L	0.02		5.961111E-02	7.570259E-03	17
11/4/2002	12:50	mg/L	0.028		5.961111E-02	7.570259E-03	17
10/7/2002	14:31	mg/L	0.017	J	5.961111E-02	7.570259E-03	17
12/5/2000	14:00	mg/L	0.025		0.014	0.004	16
9/7/1998	15:30	mg/L	0.026		0.012	0.005	18
7/13/1998	16:00	mg/L	0.026		0.012	0.005	18
11/3/1997	12:35	mg/L	0.029		0.014	0.004	16
10/13/1997	12:50	mg/L	0.037		0.014	0.004	16
9/15/1997	12:15	mg/L	0.03		0.012	0.005	18
5/12/1997	13:00	mg/L	0.126		0.026	0.031	18
12/9/1996	16:00	mg/L	0.785		0.014	0.004	16
Suspended Solids
date	time	units	result	remark	QMEAN	QSD	QDP
5/7/2008	10:50	mg/L	26		9.833333	7.453779	18
1/11/2006	10:40	mg/L	30		7	8.526774	18
9/4/2000	16:50	mg/L	44	J	3.778	2.669	18
7/5/1999	16:50	mg/L	11		3.778	2.669	18
6/14/1999	18:00	mg/L	66		16.833	20.039	18
7/13/1998	16:00	mg/L	11		3.778	2.669	18
7/14/1997	12:40	mg/L	11		3.778	2.669	18
5/12/1997	13:00	mg/L	64		16.833	20.039	18
12/9/1996	16:00	mg/L	116		10.059	27.399	17
Temperature
date	time	units	result	remark	QMEAN	QSD	QDP
10/6/2003	13:13	deg C	15.6	J	6.883333	3.15916	18
10/7/2002	14:31	deg C	14.5		6.883333	3.15916	18
8/14/2001	14:25	deg C	23.8		16.765	2.373	17
7/5/1999	16:50	deg C	9.9		16.765	2.373	17
1/12/1998	12:20	deg C	-1.2		3.7	2.017	15
Total Persulf Nitrogen
date	time	units	result	remark	QMEAN	QSD	QDP
6/4/2008	13:06	mg/L	0.13		9.388889E-02	1.531585E-02	18
5/7/2008	10:50	mg/L	0.142		9.388889E-02	1.531585E-02	18
9/11/2007	11:12	mg/L	0.396		0.1852778	7.327612E-02	18
1/11/2006	10:40	mg/L	0.477		0.2043889	0.0507846	18
4/12/1999	14:35	mg/L	0.444		0.144	0.072	12
3/10/1997	14:40	mg/L	0.339		0.23	0.054	10
Turbidity
date	time	units	result	remark	QMEAN	QSD	QDP
6/3/2009	09:32	NTU	5.6		2.588889	1.472448	18
7/9/2008	11:15	NTU	1.9		0.9722222	0.3847162	18
11/14/2006	10:25	NTU	5.2		1.294444	1.611529	18
1/11/2006	10:40	NTU	12	J	1.777778	1.600204	18
6/14/1999	18:00	NTU	27		5.472	7.266	18
7/14/1997	12:40	NTU	3.7		1.294	0.906	18
5/12/1997	13:00	NTU	24		5.472	7.266	18
12/9/1996	16:00	NTU	9.8		2.288	2.845	17

Note: QMEAN, QSD, and QDP are the quarterly mean, standard deviation, and number of data points for the last six years, where available, for the station shown.

Washington State Department of Ecology

Data users please read disclaimer.

Questions or comments on content may be sent to Dave Hallock
Questions or comments on presentation may be sent to Steve Barrett.