Larimer County Water Quality: 4 Cities Ranked by the Records

Name: Larimer County Water Quality Data (2026)
Creator: PurityMap
License: https://creativecommons.org/licenses/by/4.0/

Larimer County, Colorado: 4 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my system Open on the map Private wells in Larimer County

Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

LithiumDetected in 2 systems of 4 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest61.2 µg/L

WELLINGTON TOWN OF61.2 µg/LSample date: 2024-01-09 to 2024-10-16
BERTHOUD TOWN OF12.3 µg/LSample date: 2023-02-13 to 2023-11-06
ESTES PARK TOWN OFNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-02-27 to 2023-11-13
LOVELAND CITY OFNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-12-16 to 2025-09-16

Lead (90th percentile)Detected in 4 systems15 µg/L federal action level · US EPAHighest10 µg/L

BERTHOUD TOWN OF10 µg/LMonitoring period: 2025–2025
WELLINGTON TOWN OF3.7 µg/LMonitoring period: 2026–2026 (still open)
LOVELAND CITY OF3.3 µg/LMonitoring period: 2023–2025
ESTES PARK TOWN OF1.4 µg/LMonitoring period: 2023–2025

29 PFAS tested, none detected in any systemShow

Tested in these 4 systems: BERTHOUD TOWN OF, ESTES PARK TOWN OF, LOVELAND CITY OF, WELLINGTON TOWN OF

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorobutanesulfonic acid (PFBS)
Perfluorobutanoic acid (PFBA)
Perfluorodecanoic acid (PFDA)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorohexanoic acid (PFHxA)
Perfluorononanoic acid (PFNA)
Perfluorooctanesulfonic acid (PFOS)
Perfluorooctanoic acid (PFOA)
Perfluoropentanesulfonic acid (PFPeS)
Perfluoropentanoic acid (PFPeA)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)

4 cities

Cities ranked by the records

1
Estes ParkESTES PARK TOWN OF
No PFAS detectedLead below action level
Open city report →
2
LovelandLOVELAND CITY OF
No PFAS detectedLead below action level
Open city report →
3
WellingtonWELLINGTON TOWN OF
No PFAS detectedLead below action level
Open city report →
4
BerthoudBERTHOUD TOWN OF
No PFAS detectedLead below action level
Open city report →

Showing 4 of 4 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Larimer CountyPFAS detected in 0 of 4 cities; none had a sample above a 2024 EPA limit

4.0 ng/L federal MCL · PFOS, ng/LPFAS in Colorado

Lead

0of 4 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Colorado

Who supplies the county

Largest water systems

LovelandLOVELAND CITY OF · CO0135485
91,077 served
Estes ParkESTES PARK TOWN OF · CO0135257
16,722 served
BerthoudBERTHOUD TOWN OF · CO0135138
14,211 served
WellingtonWELLINGTON TOWN OF · CO0135838
11,720 served

Questions

Frequently asked

How does Larimer County tap water compare across cities?

PurityMap ranks 4 cities in Larimer County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Estes Park's main water system: ESTES PARK TOWN OF · PWSID CO0135257 · Purity Score 97 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Larimer County cities had a PFAS sample above a 2024 EPA limit?

None of the 4 Larimer County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 0.

Is there lead in Larimer County tap water?

Utilities report lead as a 90th-percentile result from home taps. 4 of 4 Larimer County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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