Sampling Scope and Data Limitations for Burleigh County Water
Four samples were taken from the Bismarck City of public water system for perchlorate between 2002-02-12 and 2002-10-29
This system serves over 72,000 people through more than 21,000 connections using surface water sources. Four samples over an eight-month period provide a limited but official snapshot of perchlorate presence in this municipal supply.
No perchlorate was detected above the laboratory’s reporting level of 4.0 micrograms per liter in any of these samples
The absence of reported values above this threshold means the instrument did not measure perchlorate concentrations at or above that level during those tests. This is not a continuous measurement, so concentrations can vary at other times or locations.
Understanding Certified Laboratory Test Reports for Perchlorate
Perchlorate test results from certified labs list concentrations in micrograms per liter (µg/L) or parts per billion (ppb)
These quantitative results communicate the measured amount of perchlorate in a given water sample. Results below a reporting level indicate perchlorate was either absent or present at levels too low for the instrument to measure reliably.
Reading results requires comparing reported values to health-based guidelines or advisories if applicable, noting that the EPA has no federal maximum contaminant level for perchlorate
While there is no federal standard defining a maximum safe concentration, users can consider state or local guidance where available or consult with water quality professionals to interpret the significance of test results.
Consequences of Leaving Perchlorate Untreated in Household Water
Perchlorate can affect thyroid gland function by interfering with iodine uptake when present at elevated levels over time
Long-term exposure to perchlorate in drinking water at higher concentrations may influence hormone production, particularly for sensitive groups. However, Bismarck’s water system records show no health-based violations related to perchlorate.
Without specific testing, a homeowner cannot determine their individual water’s perchlorate level
Because area data reflect system-wide results, individual wells or connections might differ. Testing personal water samples through a certified laboratory is necessary to know your home's perchlorate level.
Effect of Using the Autotrol Perchlorate Filter on Water at the Tap
The Autotrol Perchlorate Filter employs a specialized treatment process designed to reduce perchlorate concentrations in household water
When configured within a household water system, this technology works by removing perchlorate molecules, leading to lower levels delivered to the tap compared to untreated water. This can provide peace of mind for users seeking targeted perchlorate reduction.
Treated water maintains general water quality and does not introduce additives or chemicals during perchlorate removal
The filtration method used preserves the water's overall characteristics while selectively removing this constituent without altering other beneficial minerals.
How Perchlorate Enters Surface Water and Distribution Systems in Burleigh County
Perchlorate sources in surface water can include industrial activities, agricultural runoff, and atmospheric deposition
While the exact origin of perchlorate detected in municipal water is not pinpointed, such constituents typically result from historical or ongoing environmental inputs that affect surface water bodies supplying the system.
Natural degradation of perchlorate in surface water is slow, so treatment at the household level may be considered based on individual water testing
Given its persistence, perchlorate may remain in the water throughout the distribution system unless addressed by specific technologies like the Autotrol Perchlorate Filter.
What Not to Infer from Area Perchlorate Data
The absence of perchlorate detection above 4.0 µg/L in the Bismarck water system does not guarantee the same for any individual home's water
System-wide data reflect only the municipal supply at sampling times and locations. Private wells or household plumbing conditions can lead to different water quality results requiring personal testing.
No health-based violations for perchlorate have been recorded for this public water system, so municipal water remains within regulatory limits for this constituent
This underscores that perchlorate presence at or below reporting levels is not classified as a safety issue by federal standards, though individual preferences for treatment may vary.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2002-10-29. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR1 monitoring (2001-2005) for BISMARCK CITY OF (ND0800080), ND: 4 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
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