Chromium-6 in Missoula Water: Understanding Local Sampling to Assess Your Household’s Needs

This week, decide how your household will assess chromium-6 presence in its water supply based on regional data and your water use.

Identifying Household Symptoms Linked and Not Linked to Chromium-6

Water taste or color changes do not necessarily indicate chromium-6

No aesthetic changes like taste or discoloration are specifically tied to chromium-6 at the low levels found in Missoula's water system.

Household appliances may have staining but other factors are usually responsible

Staining on fixtures or clothes tends to result from other minerals or conditions, not chromium-6.

Health symptoms cannot confirm chromium-6 presence

Health effects cannot be assessed from symptoms alone; professional water testing is required for clear evaluation.

Understanding the Sampling Scope Behind Local Chromium-6 Figures

Mountain Water Company public system serves 68,200 people with 28,046 connections

The chromium-6 monitoring data comes from this public groundwater system covering Missoula.

52 samples detected chromium-6 above 0.03 µg/L reporting level from 2013 to 2015

Each detection is a measured presence; none exceed federal safety standards because no MCL exists specifically for chromium-6.

No tests in this dataset indicate chromium-6 above total chromium federal limit of 100 µg/L

The highest recorded chromium-6 value was 0.35 µg/L, well below the total chromium limit.

Adjustments for Larger Households, Second Homes, or Seasonal Properties

Larger water use affects treatment system sizing requirements

If your household uses more water daily, your treatment system should have proportionally greater capacity.

Secondary or seasonal properties may use fewer gallons with longer idle periods

Treatment needs vary when water use is intermittent; sizing and maintenance considerations adjust accordingly.

Shared water connections or communal wells require system capacity for combined demand

Where multiple households draw from the same source, treatment solutions must match overall water volume and quality.

Evaluating Treatment Capacity Relative to Household Water Demand

Estimate daily water use to choose adequate filter throughput

Knowing your average daily water consumption helps determine the treatment capacity necessary to manage chromium-6 effectively.

Treatment systems like the Pentair Chromium-6 Filter ship ready to configure for household use

This filter is designed to address chromium-6 presence at levels typical in municipal groundwater systems like Missoula's.

Ongoing monitoring and testing ensure treatment remains appropriate over time

Because water quality can fluctuate, periodic testing of your household supply is recommended to verify treatment effectiveness.

Interpreting 'Detected', Median, and Range in the Local Sampling Record

'Detected' means the instrument measured chromium-6 presence, not a violation or unsafe condition

The consistent detection in 52 samples indicates chromium-6 presence but within ranges not regulated as unsafe by federal standards.

Median detected level of 0.1355 µg/L shows typical concentration in sampled water

This statistical midpoint suggests most readings cluster near this low concentration.

Highest recorded level of 0.35 µg/L remains below the total chromium maximum contaminant level

No chromium-6 measurement surpasses federal total chromium limits, so these are baseline data points, not compliance failures.

What You Should Not Conclude from These Local Data

Do not assume your household water has these exact chromium-6 levels. Individual testing is the only way to know your specific water quality. The presence of chromium-6 detections in public records does not mean the water is unsafe or in violation of any federal health standard. Rather, these data provide a general sense of what has been measured in the regional public system’s groundwater source.

Deciding whether to pursue water testing and treatment depends on your household’s specific water use, concern level, and preference for precaution. The Pentair Chromium-6 Filter offers a documented approach to managing chromium-6 when it is detected in home water supplies.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-11-17. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Mountain Water Company (MT0000294), MT: 104 results across 2 listed contaminants, 65 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L