City of Boulder Water Quality Monitoring
Boulder Creek Watershed
North Boulder Creek - Boulder Creek
Longitudinal Nitrate + Nitrite Profiles for November, 1999

Preliminary Data - subject to revision

Marker Indicates no data available
Marker Indicates data exceeds plot scale.

Information on Nitrate + Nitrite:

Nitrogen occurs in water in various forms, including nitrate (NO3), nitrite (NO2), and ammonia (NH3). Nitrate enters waterways from lawn fertilizer run-off, leaking septic tanks, animal wastes, industrial waste waters, sanitary landfills and discharges from car exhausts. The burning of fossil fuels releases NOX compounds into the air that fall as acid rain (HNO3). Nitrates in water can cause severe illness in infants and domestic animals.

Ammonia is the decay product of animal proteins and is sometimes found in wastewater. Through the process of nitrification, ammonia in wastewater is oxidized to nitrite and then to nitrate by bacterial or chemical reactions.

More general information about Nitrate + Nitrite
Measurement of Nitrate + Nitrite
Factors affecting Nitrate + Nitrite
Standards regarding Nitrate + Nitrite
Interpretation of Boulder Creek Nitrate + Nitrite data
Data Source: City of Boulder Water Quality Monitoring
Point of Contact: Chris Rudkin
Collection and Analysis notes
Analysis method: 8192 Hach DR 2000 (low range Cd reduction)

Indicated monitoring site:

The above map indicates water quality monitoring sites. To view data at a specific site select it from the map with the mouse.

Plot Label SiteName NO3+NO2
mg/L as N
NBC-Lw North Boulder Creek diversion to Lakewood 0.03*
NBC-FALLS North Boulder Creek at Boulder Falls 0.00*
BC-ORO Boulder Creek at Orodell 0.00*
BC-CAN Boulder Creek at Eben G. Fine Park 0.00*
BC-61 Boulder Creek at 61st St. 0.20
BC-aWWTP Boulder Creek above WW Plant 0.10
BC-75 Boulder Creek at 75th St 10.50
BC-aDC Boulder Creek above Dry Creek 8.90
BC-95 Boulder Creek at 95th St 8.50
BC-107 Boulder Creek at 107th St 5.30
BC-aCC Boulder Creek Above Coal Creek 4.00
BC-bCC Boulder Creek Below Coal Creek 2.90
*value below detection limit:
Detection Limit (if available) 0.1

Preliminary Data - subject to revision

Select on the parameter name to view more detailed information for that parameter in this month. Select on the site name to view data time series observed at that station. For monitoring site locations see site location map.

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