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THORNTON CITY OFmain system
City water report · 2026

Is Thornton Tap Water Safe? 2026 Water Quality Report

Short answer: Two PFAS, PFOA and PFOS, are above their federal limits (2024 limits that water systems have until at least 2029 to meet); lithium sits above a screening level. Thornton City of serves 226,465 residents.

Explore the findingsWhat can I do?Follow
Likely match, check your bill

4 water systems report serving Thornton

This report uses the largest, THORNTON CITY OF. Your water bill or annual water quality report names your actual supplier.

Source
Surface water
Lead service lines
0 lead

Source: EPA SDWIS 2026Q2.

Your water utility

City of Thornton: contact and record

What stands out

Two PFAS above the 2024 federal limit

Each bar is drawn in blocks of the 4.0 ng/L federal MCL (2024), so the length shows how far above it the result sits.

PFOA

Perfluorooctanoic acid

1.8× the limit

7.1ng/L

Each block = 4.0 ng/L federal MCL (2024)

EPA UCMR 5 · sampled 2023Evidence
PFOS

Perfluorooctanesulfonic acid

1.3× the limit

5ng/L

Each block = 4.0 ng/L federal MCL (2024)

EPA UCMR 5 · sampled 2023Evidence

Coverage by group

31 results on record
  • PFAS (forever chemicals)2 above · 6 detected · 21 not detected
  • Metals & lead1 detected
  • Disinfection by-productsNot monitored
  • Other1 above
Every detected result

10 detected results, by distance from their limit

THORNTON CITY OF (EPA PWSID CO0101150) delivers surface water to 226,465 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. Water hardness and disinfectant type are pending the utility's own annual report.

21 other contaminants tested, none detected
  • 11Cl-PF3OUdS
  • 4:2 FTS
  • 6:2 FTS
  • 8:2 FTS
  • 9Cl-PF3ONS
  • ADONA
  • HFPO-DA (GenX)
  • NEtFOSAA
  • NFDHA
  • NMeFOSAA
  • PFDA
  • PFDoA
  • PFEESA
  • PFHpS
  • PFMBA
  • PFMPA
  • PFNA
  • PFPeS
  • PFTA
  • PFTrDA
  • PFUnA
Track record

0health-based violations in the last 10 years

From EPA SDWIS. A clean violation history means no enforcement action was recorded; it does not cover contaminants without a limit.

Not in this recordDisinfection by-products weren't monitored in this dataset

No result is not a pass. Your utility's annual water quality report may list them, and a certified lab test covers your own tap.

What you can do

Test first, then treat what was found

  1. 01 · TestTest your own tap

    Plumbing inside a home can add lead that the system record can't show. A tap test tells you what reaches your glass.

    Certified lab
    How to test your tap →
  2. 02 · Treat PFASReverse osmosis, or carbon certified for PFAS

    PFOA 7.1 ng/L, above the 4 ng/L limit (+7 more PFAS detected)

    NSF/ANSI 58 or 53, with PFOA/PFOS/PFBS/PFHxA/PFHxS/PFBA/PFHpA/PFPeA named on the listing
    Treatment for PFAS →
  3. 03 · LeadLead-certified carbon filter, or reverse osmosis

    lead 2.3 µg/L, below the 15 µg/L action level

    NSF/ANSI 53 (lead)
    Treatment for Lead →

Understand water treatment technologies →

Test your own tap

Screening tells you if something is worth a closer look; a lab result is the number you can act on.

As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.

  • Screening: quick check, not lab-grade

    Safe Home DIY Lead in Drinking Water Combo Test Kit

    Safe Home (EnviroTestKits)

    Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb

    • Turnaround: 5 minutes

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  • Lab-certified results

    ETR Labs Basic Water Quality Test Kit

    ETR Laboratories

    50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria

    What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.

    Check price on Amazon
Commercial

Certified for a concern found here

Each card names which Thornton findings its current certification covers, and which it doesn't.

As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.

Under-Sink Filter

Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M)

  • PFOA: eligible, evidence match
  • PFOS: eligible, evidence match
  • Lead: eligible, evidence match
  • Not established: Lithium, Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA) and 4 more
Not suitable for (5)
  • Treating every tap in the home
  • A whole-home hard-water or scale problem
  • All PFAS: its evidence covers only the compounds it names
  • Anyone who can't plumb, drill or hire an installer
  • Renters who can't modify plumbing
See the evidenceCheck price on Amazon
Countertop System

Aquasana Clean Water Machine Countertop Filter (AQ-CWM2)

  • PFOA: eligible, evidence match
  • PFOS: eligible, evidence match
  • Lead: eligible, evidence match
  • Not established: Lithium, Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA) and 4 more
Not suitable for (3)
  • Treating every tap in the home
  • A whole-home hard-water or scale problem
  • All PFAS: its evidence covers only the compounds it names
See the evidenceCheck price on Amazon
See all 9 products certified for a Thornton concern →
Countertop System

AquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000)

  • PFOA: eligible, evidence match
  • PFOS: eligible, evidence match
  • Lead: eligible, evidence match
  • Not established: Lithium, Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA) and 4 more
Not suitable for (3)
  • Treating every tap in the home
  • A whole-home hard-water or scale problem
  • All PFAS: its evidence covers only the compounds it names
See the evidenceCheck price on Amazon
Under-Sink Filter

Under-Sink Reverse-Osmosis System

  • PFOA: eligible, evidence match
  • PFOS: eligible, evidence match
  • Lead: eligible, evidence match
  • Not established: Lithium, Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA) and 4 more
Not suitable for (5)
  • Treating every tap in the home
  • A whole-home hard-water or scale problem
  • All PFAS: its evidence covers only the compounds it names
  • Anyone who can't plumb, drill or hire an installer
  • Renters who can't modify plumbing
See the evidenceCheck price on Amazon
Under-Sink Filter

Waterdrop G3P600 Tankless Reverse-Osmosis System

  • PFOA: eligible, evidence match
  • PFOS: eligible, evidence match
  • Lead: eligible, evidence match
  • Not established: Lithium, Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA) and 4 more
Not suitable for (5)
  • Treating every tap in the home
  • A whole-home hard-water or scale problem
  • All PFAS: its evidence covers only the compounds it names
  • Anyone who can't plumb, drill or hire an installer
  • Renters who can't modify plumbing
See the evidenceCheck price on Amazon
Refrigerator Filter

Whirlpool Filter 3 Refrigerator Water Filter (WHR3RXD1)

  • PFOA: eligible, evidence match
  • PFOS: eligible, evidence match
  • Lead: eligible, evidence match
  • Not established: Lithium, Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA) and 4 more
Not suitable for (3)
  • Treating every tap in the home
  • A whole-home hard-water or scale problem
  • All PFAS: its evidence covers only the compounds it names
See the evidenceCheck price on Amazon
Water Pitcher

Culligan ZeroWater 10-Cup Pitcher (ZEROP10)

  • Lead: eligible, evidence match
  • Not established: PFOA, PFOS, Lithium and 6 more
Not suitable for (3)
  • Treating every tap in the home
  • A whole-home hard-water or scale problem
  • All PFAS: its evidence covers only the compounds it names
See the evidenceCheck price on Amazon
Faucet Attachment

Faucet-Mount Filter

  • Lead: eligible, evidence match
  • Not established: PFOA, PFOS, Lithium and 6 more
Not suitable for (3)
  • Treating every tap in the home
  • A whole-home hard-water or scale problem
  • All PFAS: its evidence covers only the compounds it names
See the evidenceCheck price on Amazon
Under-Sink Filter

Under-Sink Carbon Block Filter

  • Lead: eligible, evidence match
  • Not established: PFOA, PFOS, Lithium and 6 more
Not suitable for (4)
  • Treating every tap in the home
  • A whole-home hard-water or scale problem
  • All PFAS: its evidence covers only the compounds it names
  • Anyone who can't plumb, drill or hire an installer
See the evidenceCheck price on Amazon
Questions

Frequently asked questions

Is Thornton tap water safe to drink?

PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Thornton, PFOA 7.1 ng/L and PFOS 5 ng/L were measured above the 4 ng/L federal limit in EPA's 2024 testing; the lead 90th-percentile result was 2.3 µg/L against the 15 µg/L action level. THORNTON CITY OF (PWSID CO0101150) has a Purity Score of 59/100 (confidence: moderate), assessed at the water-system level and computed only from contaminants that were measured. Water can change in your own pipes, so a certified test is the only way to know what comes out of your tap.

Who provides tap water in Thornton?

THORNTON CITY OF (PWS ID CO0101150) is the public water system on record for Thornton, Colorado, serving about 226,465 people. Confirm the utility on your water bill before acting on a specific finding.

Where does Thornton get its drinking water?

Surface water (primary source of record in EPA SDWIS).

Are PFAS "forever chemicals" in Thornton's water?

Yes. In EPA's UCMR 5 testing (2023-02-14 to 2023-11-27), PFOA was measured at 7.1 ng/L against a 4 ng/L federal limit and PFOS was measured at 5 ng/L against a 4 ng/L federal limit. PFBS (8.1 ng/L, below the 2,000 ng/L EPA health advisory), PFHxA (12.6 ng/L, below the 400,000 ng/L state limit) and PFHxS (5.9 ng/L, below the 10 ng/L federal limit) were also detected. PFBA (10.4 ng/L), PFHpA (3.7 ng/L) and PFPeA (12.4 ng/L) were also detected; they have no federal or state limit. Reverse osmosis and filters certified to NSF/ANSI 53 for PFOA/PFOS reduce them at the tap.

Is there lead in Thornton's tap water?

THORNTON CITY OF's most recent lead 90th-percentile result (2025) was 2.3 µg/L, below the 15 µg/L action level. That figure comes from sampled homes; lead usually enters from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

What does the latest Thornton water report show?

PurityMap's current record for Thornton holds 31 findings: 3 above a reference, 4 detected within the reference, 3 detected with no limit and 21 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass.

Follow this water

Follow Thornton's water

One email when a new sampling round is published, a result moves above or below its reference, or the system's score changes.

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Sources and dataAll 31 records and their sourcesEPA UCMR 5 · EPA SDWIS (Lead & Copper Rule)
ContaminantResultBenchmarkSampledSource
Lithium34 µg/L10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluorooctanoic acid (PFOA)7.1 ng/L4.0 ng/L federal MCL (2024)2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluorooctanesulfonic acid (PFOS)5 ng/L4.0 ng/L federal MCL (2024)2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluorohexanesulfonic acid (PFHxS)5.9 ng/L10 ng/L federal MCL (2024)2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Lead (90th percentile)2.3 µg/L15 µg/L federal action level2025–2025 monitoring periodLead & Copper Rule 90th-percentile: THORNTON CITY OF (CO0101150)
Perfluorobutanesulfonic acid (PFBS)8.1 ng/L2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluorohexanoic acid (PFHxA)12.6 ng/L400,000 ng/L Michigan EGLE state MCL (strictest US state)2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluorobutanoic acid (PFBA)10.4 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluoroheptanoic acid (PFHpA)3.7 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluoropentanoic acid (PFPeA)12.4 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
21 other PFAS tested — none detected
ContaminantResultBenchmarkSampledSource
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)< 5 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)< 5 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)< 3 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)< 5 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)< 3 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)< 2 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)< 5 ng/L10 ng/L federal MCL (2024)2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)< 5 ng/LNo federal or state limit; shown for transparency2023-05-30 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)< 6 ng/LNo federal or state limit; shown for transparency2023-05-30 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)< 20 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)< 3 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluoro-3-methoxypropanoic acid (PFMPA)< 4 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluoro-4-methoxybutanoic acid (PFMBA)< 3 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluorodecanoic acid (PFDA)< 3 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluorododecanoic acid (PFDoA)< 3 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluoroheptanesulfonic acid (PFHpS)< 3 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluorononanoic acid (PFNA)< 4 ng/L10 ng/L federal MCL (2024)2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluoropentanesulfonic acid (PFPeS)< 4 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluorotetradecanoic acid (PFTA)< 8 ng/LNo federal or state limit; shown for transparency2023-05-30 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluorotridecanoic acid (PFTrDA)< 7 ng/LNo federal or state limit; shown for transparency2023-05-30 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)
Perfluoroundecanoic acid (PFUnA)< 2 ng/LNo federal or state limit; shown for transparency2023-02-14 to 2023-11-27UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)

Lithium

Result
34 µg/L
Benchmark
10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit
Sampled
2023-02-14 to 2023-11-27

Perfluorooctanoic acid (PFOA)

Result
7.1 ng/L
Benchmark
4.0 ng/L federal MCL (2024)
Sampled
2023-02-14 to 2023-11-27

Perfluorooctanesulfonic acid (PFOS)

Result
5 ng/L
Benchmark
4.0 ng/L federal MCL (2024)
Sampled
2023-02-14 to 2023-11-27

Perfluorohexanesulfonic acid (PFHxS)

Result
5.9 ng/L
Benchmark
10 ng/L federal MCL (2024)
Sampled
2023-02-14 to 2023-11-27

Lead (90th percentile)

Result
2.3 µg/L
Benchmark
15 µg/L federal action level
Sampled
2025–2025 monitoring period

Perfluorobutanesulfonic acid (PFBS)

Result
8.1 ng/L
Benchmark
2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit
Sampled
2023-02-14 to 2023-11-27

Perfluorohexanoic acid (PFHxA)

Result
12.6 ng/L
Benchmark
400,000 ng/L Michigan EGLE state MCL (strictest US state)
Sampled
2023-02-14 to 2023-11-27

Perfluorobutanoic acid (PFBA)

Result
10.4 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

Perfluoroheptanoic acid (PFHpA)

Result
3.7 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

Perfluoropentanoic acid (PFPeA)

Result
12.4 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27
21 other PFAS tested — none detected

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)

Result
< 5 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)

Result
< 5 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)

Result
< 3 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)

Result
< 5 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

4,8-Dioxa-3H-perfluorononanoic acid (ADONA)

Result
< 3 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)

Result
< 2 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)

Result
< 5 ng/L
Benchmark
10 ng/L federal MCL (2024)
Sampled
2023-02-14 to 2023-11-27

N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)

Result
< 5 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-05-30 to 2023-11-27

N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)

Result
< 6 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-05-30 to 2023-11-27

Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)

Result
< 20 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)

Result
< 3 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

Perfluoro-3-methoxypropanoic acid (PFMPA)

Result
< 4 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

Perfluoro-4-methoxybutanoic acid (PFMBA)

Result
< 3 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

Perfluorodecanoic acid (PFDA)

Result
< 3 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

Perfluorododecanoic acid (PFDoA)

Result
< 3 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

Perfluoroheptanesulfonic acid (PFHpS)

Result
< 3 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

Perfluorononanoic acid (PFNA)

Result
< 4 ng/L
Benchmark
10 ng/L federal MCL (2024)
Sampled
2023-02-14 to 2023-11-27

Perfluoropentanesulfonic acid (PFPeS)

Result
< 4 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

Perfluorotetradecanoic acid (PFTA)

Result
< 8 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-05-30 to 2023-11-27

Perfluorotridecanoic acid (PFTrDA)

Result
< 7 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-05-30 to 2023-11-27

Perfluoroundecanoic acid (PFUnA)

Result
< 2 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-02-14 to 2023-11-27

Every value is the published result from the cited public record. A reporting limit is the lowest level the method could reliably quantify; a non-detect is not a guarantee of zero.

  • UCMR5 Analytical Results

    UCMR5 Analytical Results: THORNTON CITY OF (CO0101150)

    US EPA

    Published
    2026-01-15
    Newest sample
    2023-11-27
    Findings here
    30

    View source ↗Source record

  • State SDWIS Compliance Record

    Lead & Copper Rule 90th-percentile: THORNTON CITY OF (CO0101150)

    US EPA SDWIS

    Published
    2026-07-09
    Newest sample
    2025
    Findings here
    1

    View source ↗Source record

Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.

Data & methodologyHow we analyze waterData integrity policy

Something off with your water's smell, color or taste?

Start with the hot-or-cold tap check. Where Thornton City of reported something related, it's shown below.