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Knight Island Utilities, Inc.

What EPA’s and Florida’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
431 people
Connections
201
Water source
Groundwater
Based in
Cape Haze, FL
County
Charlotte
Owner
Private
The ZIP code it serves

34224

The short answer

2 results are above the health goal. The worst: Arsenic, above the health goal. No health-based violations on file since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2015 to 2024.

Haloacetic acids (HAA5) and total trihalomethanes (TTHM): Florida’s own results, samples taken from Feb. 25, 2020 to Nov. 27, 2024, with EPA’s 2012 to 2019 file for earlier years.

Arsenic, fluoride, chromium (total) and nitrate: EPA’s compliance monitoring file, samples taken from Aug. 28, 2012 to Sept. 24, 2013. Newer results are in the utility’s annual water quality report.

Above the health goal2

Arsenic

Comes from the source

Above the health goal

2.8ppb

Highest yearly average, 2012

Averaged by year, the highest was 2.8 ppb, in 2012: below EPA’s legal limit of 10 ppb, but above its health goal of zero. That is the only year on file.

What handles it

  • NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
  • NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”

Lead

Comes from pipes, often your own

Above the health goal

3.0ppb

90th percentile, 2024

In the latest period, 9 in 10 homes sampled were at or below 3.0 ppb, below EPA’s action level of 15 ppb. The action level drops to 10 ppb on Nov. 1, 2027. EPA’s health goal for lead is zero.

What handles it

Below EPA’s limits5

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

18.8ppb

Highest yearly average, 2020 to 2024

2024 average: 13.5 ppb

Averaged by year, the highest was 18.8 ppb, in 2022, below EPA’s legal limit of 60 ppb. Its highest single sample was 29 ppb. In 2024, the latest year on file, its eight samples averaged 13.5 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 27.7 ppb, in 2018.

What handles it

No certification claim covers this compound yet.

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

16.1ppb

Highest yearly average, 2020 to 2024

Averaged by year, the highest was 16.1 ppb, in 2024, below EPA’s legal limit of 80 ppb. Its highest single sample was 20 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 42.7 ppb, in 2016.

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

0.1ppm

Highest yearly average, 2012

Averaged by year, the highest was 0.1 ppm, in 2012, below EPA’s legal limit of 4.0 ppm. That is the only year on file.

What handles it

Chromium (total)

Comes from the source

Below EPA’s limits

0.5ppb

Highest yearly average, 2012

Averaged by year, the highest was 0.5 ppb, in 2012, below EPA’s legal limit of 100 ppb. That is the only year on file.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.03ppm

Highest sample; found in 2 of 2

2013, one sample: 0.03 ppm

The highest sample, in 2013, was 0.03 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its one sample was 0.03 ppm.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”

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.”

  • NSF/ANSI 53

    Claims: Arsenic (Pentavalent)<=50 ppb Reduction, Lead Reduction

    For: Arsenic, Lead

    Other certifiers’ wording: Arsenic (III) (50 ppb influent level)

  • NSF/ANSI 58

    Claims: Arsenic (Pentavalent)<=50 ppb Reduction, Lead Reduction

    For: Arsenic, Lead

    Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)

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 reverse osmosis systems, ranked

The best water filters for lead, ranked

Violations since 2016

No health-based violations on file with EPA since 2016. There are 3 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Haloacetic acids (HAA5) and total trihalomethanes (TTHM) results here are Florida’s own from 2020 on, with EPA’s national file for 2012 to 2019. Arsenic, fluoride, chromium (total) and nitrate come from EPA’s file alone, which ends in 2019. Knight Island Utilities, Inc.’s own annual report, which it must send you every year, has newer results for those and 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; Florida’s results run from Feb. 25, 2020 to Nov. 27, 2024; EPA’s compliance samples are from Aug. 28, 2012 to Sept. 24, 2013.

Testing your own tap

Knight Island Utilities, Inc.’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 Florida certifies.

The 3 labs Florida certifies closest to the area Knight Island Utilities, Inc. serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Benchmark EA South

    North Port, FL · about 15 miles

    Certified for bacteria

    (941) 625-3137

  • Eurofins Nokomis

    Nokomis, FL · about 18 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (941) 488-8103

  • FL Dept. of Health - Lee County Health Department

    Ft. Myers, FL · about 36 miles

    Certified for bacteria

    (239) 274-2200

Florida Department of Health Bureau of Public Health Laboratories: Coliform and E. coli testing for private wells at the Jacksonville and Miami labs. Collection kits come from your county health department, and the sample has to reach the lab on ice the same day it is collected. $40 for private testing through the state lab. Well Water Testing, Florida Department of Health.

All 212 certified labs for Florida

Sources

PWSID FL6084075. Rebuilt from EPA data on Oct. 18, 2026.

Also in Charlotte County

All Florida utilities

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