Metals · 2024

Boron in Boulder, CO tap water

Detected — no federal limit

Boulder, CO's 2024 report shows Boron detected, but the EPA has not set an enforceable federal limit for it.

The measurement

StatisticValue
Reported level
National City Well 2
0.11–0.13 mg/L
Reported level
National City Well 3
0.2–0.23 mg/L
Reported level
National City Well 4
0.15–0.18 mg/L
Reported level
SD Formation Wells 1 - 11
0.08–0.54 mg/L
Reported level
Lake Skinner Outlet (Aqueduct)
0.15 mg/L
Reported level
Sweetwater Reservoir
0.11–0.12 mg/L
Reported level
Treated¹ Sweetwater Authority Drinking Water
0.11–0.31 mg/L
Reported level
National City Well 2
0.12 mg/L
Reported level
National City Well 3
0.22 mg/L
Reported level
National City Well 4
0.16 mg/L
Reported level
SD Formation Wells 1 - 11
0.32 mg/L
Reported level
Lake Skinner Outlet (Aqueduct)
0.15 mg/L
Reported level
Sweetwater Reservoir
0.12 mg/L
Reported level
Treated¹ Sweetwater Authority Drinking Water
0.2 mg/L

Verbatim from Boulder, CO's 2024 Consumer Confidence Report — source document ↗

About Boron

A naturally occurring element from rock and soil.

No enforceable federal limit; the EPA has issued a health advisory level.

People also ask

+Is there Boron in Boulder, CO tap water?

Yes — Boulder, CO's 2024 Consumer Confidence Report lists Boron at 0.08–0.54 mg/L. Boulder, CO's 2024 report shows Boron detected, but the EPA has not set an enforceable federal limit for it.

+What's the federal limit for Boron in drinking water?

The federal NL for Boron is 1 mg/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.

+What is Boron?

A naturally occurring element from rock and soil. No enforceable federal limit; the EPA has issued a health advisory level.

+Where does this Boron measurement come from?

This page reproduces the Boron entry from the 2024 Consumer Confidence Report published by the Boulder, CO water utility — the annual drinking-water report every U.S. utility is required by federal law to publish. The original source document is archived at /water/co/boulder/2024/source.

Full report
All Boulder, CO water-quality data →
Every contaminant measured in the 2024 report.
Contaminant pillar
Boron across the U.S. →
Every public water system measuring Boron, ranked.