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Sierra Bonita Estates

What EPA’s and Colorado’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.

Serves
122 people
Connections
48
Water source
Surface water bought from another system
Based in
Lakewood, CO
County
Arapahoe
Owner
Private
Hardness
Moderately hard

The short answer

1 result is above the health goal. The worst: Lead, above the health goal. 1 health-based violation since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2025 to 2026.

Haloacetic acids (HAA5), total trihalomethanes (TTHM) and fluoride: Colorado’s own results, samples taken from June 24, 2024 to Aug. 21, 2026.

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

14ppb

90th percentile, 2026

In the latest period, 9 in 10 homes sampled were at or below 14 ppb, below EPA’s action level of 15 ppb. The action level drops to 10 ppb on Nov. 1, 2027, and this result is at or above that. EPA’s health goal for lead is zero.

What handles it

Below EPA’s limits3

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

48ppb

Highest yearly average, 2024 to 2026

2026 average: 14.8 ppb

Averaged by year, the highest was 48 ppb, in 2024, below EPA’s legal limit of 60 ppb. Its highest single sample was 62 ppb. In 2026, the latest year on file, its three samples averaged 14.8 ppb. EPA recorded no violation for haloacetic acids (HAA5) at this utility since 2020.

What handles it

No certification claim covers this compound yet.

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

51.7ppb

Highest yearly average, 2024 to 2026

2026 average: 19.1 ppb

Averaged by year, the highest was 51.7 ppb, in 2024, below EPA’s legal limit of 80 ppb. Its highest single sample was 61 ppb. In 2026, the latest year on file, its three samples averaged 19.1 ppb.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.66ppm

Highest yearly average, 2024

Averaged by year, the highest was 0.66 ppm, in 2024, below EPA’s legal limit of 4.0 ppm. That is the only year on file.

What handles it

What handles it

A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”

At the tap, or for the whole house?

Lead and copper usually come from pipes and fixtures inside or near your home. A whole-house system sits where water enters, so it cannot catch what your own plumbing adds after it. For those, the filter that counts is the one at the tap. How whole-house systems compare.

Filters with those claims on a certifier’s listing

Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

Compare five-year costs

The best water filters for lead, ranked

Hardness

Moderately hard, typically 80 mg/L (4.6 grains per gallon), across 2 sampling points, in 2024.

Hardness is calcium and magnesium. EPA sets no limit for it: it shows up as scale on fixtures and in water heaters, and as soap that won’t lather. USGS calls water above 60 mg/L moderately hard, above 120 hard and above 180 very hard.

Softeners compared at 4.6 grains per gallon, salt includedSoftener or salt-free conditioner?Colorado water hardness, utility by utility

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Lead and Copper Rule RevisionsThe required inventory of lead service lines was not completed or submitted on time.EPA: LSL InventoryJuly 2, 2025—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 2 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Haloacetic acids (HAA5), total trihalomethanes (TTHM) and fluoride results here are Colorado’s own from 2024 on, with EPA’s national file for 2012 to 2019. Sierra Bonita Estates’s own annual report, which it must send you every year, has the contaminants this page does not show.

  • Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.

  • What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.

  • Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; Colorado’s results run from June 24, 2024 to Aug. 21, 2026.

Testing your own tap

Sierra Bonita Estates’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab Colorado certifies.

No lab Colorado certifies is within 75 miles of the area Sierra Bonita Estates serves on the state’s list. Some take samples by mail; the state’s page lists them all.

All 54 certified labs for Colorado

Sources

PWSID CO0103710. Rebuilt from EPA data on Oct. 18, 2026.

Also in Arapahoe County

All Colorado utilities

What to do next