Giardia – A protozoan parasite. Occurrence in water sample must be confirmed by identification of two or more morphological
characteristics, nuclei, axoneme and/or median body.
Samples are collected in accordance with the EPA “Consensus
Method for Determining Groundwaters Under the Direct Influence
of Surface Water Using Microscopic Particulate Analysis (MPA).”
Two sampling events are recommended, one during a dry period and
a second during a wet period. Turbidity, temperature, rainfall and
stream flow records, and conductivity etc. may be used for guidance
for when to test.
What is MPA and how can it be used to differentiate ground
water under surface influence?
The premise behind the use of microscopic particulate analysis
(MPA) is that surface waters are subject to contamination by
pathogens such as Giardia and that there are other organisms whose
natural habitat is limited to surface waters. If these surface water
organisms are found in ground water, then the water is subject to
contamination with Giardia cysts and other pathogens. Indicators of
surface water contamination of ground waters include: Giardia,
coccidia including Cryptosporidium, diatoms and certain other algae,
rotifers, green plant material, and insect parts.
Historical water quality records
1. At least three years of Total Coliform and/or Fecal Coliform data.
2. Turbidity and temperature records including those of nearby
surface water sources.
3. No history of a known or suspected outbreak of Giardia,
Cryptosporidium or other pathogenic organisms associated with
surface water that has been attributed to the source.
4. No evidence of particulate matter associated with surface water.
On site inspection
1. No evidence for surface water infiltration.
2. Sufficient distances from surface water sources.Cryptosporidium
The EPA Guidance Manual defines a ground water source under
direct influence of surface water as water in which there is either:
“significant occurrence of insects or macroorganisms, algae, organic
debris, or large-diameter pathogens such as Giardia lamblia.”
“significant and relatively rapid shifts in water characteristics such
as turbidity, temperature, conductivity, or pH which closely correlate
to climatological or surface water condition.”
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Scientists suspect that parts of the San Joaquin Valley have started to sink again after years of stability, a troubling development that geologists say can be traced to increased pumping of groundwater. …. latimes.com
… of the ground with significant occurrence of insects, macroorganisms, algae, or large diameter pathogens such as giardia lamblia or cryptosporidium. … Click Here
EAL is approved for protozoan and virus testing through NELAP and holds approval for Methods 1622/1623 for Giardia and Cryptosporidium for the LT2 through EPA. We can assist with microbial services including:
1. Analyses for Giardia and Cryptosporidium with water and wastewater
2. Analyses for total culturable viruses
3. Microscopic Particulate Analysis (MPA) for ground water and filtration evaluation
4. On-Site pilot plant studies and sampling services
5. Many more specialty microbiology analysis and consultation
Environmental Associates Ltd. is EPA approved for the LT2. With more than 22 years experience in protozoan analyses Environmental Associates Ltd. can offer the highest quality work for the LT2. and a unique LT2 data package designed to eliminate false positives as far as scientifically possible. Please contact the laboratory for more details at (607) 272-8902.
Become informed about the rule and about EPA Methods 1622/1623. Review historical data. Discuss the rule with your consulting engineer. Secure the services of Environmental Associates Ltd. Phone 607-272-8902