Environmental Laboratory

Water Testing

The City of Rockford Environmental laboratory will accept water samples collected by contractors, well operators, well drillers, and public water system operators as long as they are submitted in approved sample bottles.  Sample bottles are available at the 1111 Cedar Street location.  Water samples should be dropped off at 1111 Cedar Street.  A City of Rockford Environmental Laboratory form must accompany each sample.  These forms are available via download, Sample Collection Form & Chain of Custody Record, or at 1111 Cedar Street. These forms must be completely filled out by the sample collector before a water sample is accepted.  Incomplete forms will result in rejection of water sample.  The City of Rockford Environmental Laboratory’s normal operating hours are Monday – Friday between the hours of 6:00 am and 2:30 pm, with normal sample submittals accepted Monday – Thursday.  Further, the City offers extended hours for specimen submittal via our self-service kiosk.  Please click here for a list of holidays in which the the Laboratory will be closed.  Please contact us at 779-348-7373 for additional information. 

Cost for analysis is as follows:




Hardness $15.00
Iron (Total) $12.00
Lead $20.00**
Manganese (Total) $12.00
MF (Membrane Filtration) $22.00
Nitrate/Nitrite $21.00
pH $15.00
Quanti-Tray $26.00
SPC $25.00
Total Coliform $19.00

*Price listed does not include tax.

**Lead Testing for City of Rockford Water Customers is done at no cost.

Samples are also accepted on weekends with a weekend surcharge equaling 2x the normal cost of analysis.


Collecting a Total Coliform or Membrane Filtration Water Sample

To perform the water sampling please read all of these instructions first.

Only State approved laboratory-prepared bottles are to be used for samples.  All water sample bottles are sterilized before distribution, and must be handled carefully to avoid contamination during the sampling process.

Sampling Point:

Select a sampling point as close as possible to the water supply source.   If possible select a faucet or spout without a threaded outlet.  Do not collect from garden hoses, dirty faucets, or swing-type faucets where foreign material may contaminate the sample.  Remove faucet screens or aerators before sampling.  Do not collect softened water.

Proceed as follows:

Make sure your hands are clean.  They should be free of soil or dirt.  Clean and disinfect the surface spout.  Commercial bleach is a very effective disinfectant to use for this process.  Do not touch the spout/faucet at the sampling point.

Before collecting sample open the tap and allow water to run at steady flow.  Slow the water flow down to the stream size of a pencil during actual collection to avoid contamination from splashing.

Carefully unscrew cap of bottle.  Hold cap without touching inside edges of cap or neck of bottle.  Do not attempt to clean or rinse bottle.  Next, fill bottle to the marked fill line or to the bottom of neck threads.  Note: Please fill the collection bottle above the 100 ml line.  Testing cannot be performed on samples with less than 100 ml of water.  Do not fill to rim, as you must leave air space in bottle.  Immediately and carefully replace cap.

For questions, please contact the Water Quality Section at 779-348-7151 or email our Water Quality Section.