High TDS in Park City Water: Our Take on the Numbers

Kirsten Kohlwey’s TownLift article about dissolved solids in local water, published November 5 and updated November 6, 2026, raises a useful question: what should residents do with a high total dissolved solids reading?

At Utah Water Quality, we think the next step is to look beyond the total. Find out which substances are present, where the sample came from, and what the results mean for your actual water supply.

A TDS reading can help start that conversation. By itself, it cannot establish whether water is safe to drink.

What do the Park City-area reports actually show?

The official reports behind the discussion describe two different water systems and monitoring periods:

Water system	Report label	Reported TDS range	Sampling years shown for TDS
Mountain Regional Water	2025 Water Quality Report	128–1,648 ppm	2022, 2024, and 2025
Park City Municipal	2026 Drinking Water Quality Report	140–1,090 ppm	2024–2025

Mountain Regional places its TDS result in the “Regulated at the Source” section. That context matters when interpreting the high end of the range. See the Mountain Regional report, printed page 6.

Park City’s report says it is actively blending with a low-TDS source to bring levels below 1,000 ppm. See the Park City report, PDF page 3.

These ranges cannot tell an individual household what is coming from its faucet today. Confirm the provider on your water bill, then ask how the report’s sources and sampling locations relate to your service area.

What does TDS measure?

Total dissolved solids describes the combined amount of dissolved material in water. It can include calcium, magnesium, sodium, chloride, and other substances. For ordinary drinking-water comparisons, ppm and milligrams per liter (mg/L) are approximately equivalent.

A handheld TDS meter estimates this total from electrical conductivity. It cannot identify the individual substances contributing to the number. The Bureau of Reclamation’s TDS fact sheet explains why conductivity provides only an estimate.

A low meter reading cannot rule out a specific contaminant, and a high reading cannot identify one. Questions about lead, arsenic, bacteria, or another particular concern require the appropriate analysis.

Why do people cite 500, 1,000, and 2,000 mg/L?

Those numbers serve different purposes:

TDS concentration	What the benchmark means
500 mg/L	EPA’s federal secondary guideline, addressing aesthetic and practical effects such as taste and deposits. It is not federally enforceable.
Above 1,000 mg/L	Utah requires the water supplier to satisfactorily demonstrate that no better water is available.
2,000 mg/L	Utah’s maximum contaminant level for TDS.

The federal value comes from EPA’s secondary drinking-water standards. The state requirements are explained in Utah DEQ’s drinking-water standards.

Crossing 500 mg/L does not, by itself, establish a health emergency. Staying below Utah’s TDS limit does not establish that every individual contaminant meets its own standard. Read the specific results and the utility’s compliance explanations together.

Does high TDS mean hard water?

Hardness measures calcium and magnesium. TDS includes a broader mix of dissolved substances, so the two measurements answer different questions. USGS explains the distinction in its hardness guide.

If your concern is scale on fixtures or appliances, look for an actual hardness result. If your concern is sodium, look for sodium. The total alone cannot tell you how much of either is present.

The comparison with bottled mineral water also has limits. A mineral water’s known composition does not explain the composition of a different water supply with a similar total.

Should you buy a filter or softener?

Start with the problem you want to solve and the relevant test results. Different technologies do different jobs:

• Activated carbon can improve taste and odor and reduce substances covered by a device’s specific claims. Conventional carbon filtration generally leaves dissolved minerals in the water.
• A conventional ion-exchange softener addresses hardness by exchanging calcium and magnesium for other ions, commonly sodium. Its effectiveness should be assessed using hardness, rather than expecting a lower TDS number.
• Reverse osmosis can reduce dissolved solids. It also produces reject water and requires maintenance. A model’s certified reduction claims determine which additional contaminants it can address.

EPA’s home water-treatment guide compares these technologies. Check the particular model’s certification for your target substance. If reverse osmosis fits the measured concern, EPA’s WaterSense guidance can help you consider water efficiency.

Our view is that the treatment decision should follow the evidence. A single meter demonstration is an incomplete basis for choosing a household system.

What should Utah residents do next?

1. Confirm your supplier. Use our address lookup, then check the provider name and public water system ID against your bill.
2. Read the correct report. Check the report year, the TDS sampling years, the sample location, and individual contaminant results. Our water-report guide explains how.
3. Ask about your service area. Which sources currently supply it? Does blending affect the water delivered there? How do source results relate to finished water?
4. Use targeted testing when a question remains. A home-specific concern needs an appropriate sample and analysis. Our testing guide links to Utah laboratory resources.
5. Follow current notices. A utility or health-authority instruction takes priority over conclusions drawn from a meter or an older annual report.

Utah Water Quality’s take is straightforward: high TDS deserves a clear explanation. Residents should be able to understand the ingredients, the sampling context, and their next step before making a decision about their water.

Sources reviewed November 6, 2026. Report labels and sampling years are shown separately above; this review date does not make those measurements current tap results.