Town of Frederick

Q: Where does the Town of Frederick get its water?

The Town of Frederick reports purchased surface water as its primary source. EPA lists its source facilities as PURCHASED FROM CARTER LAKE 135476 SW.

Q: Does the Town of Frederick have any drinking water violations?

EPA's compliance record shows no open health-based violations for the Town of Frederick at the last monthly fetch. Older and non-health-based entries, if any, are listed on this page.

The Town of Frederick is the public water system serving 17,173 people in Weld County, from purchased surface water. It buys water from Carter Lake Filter Plant. EPA modelled this service area rather than tracing it from a utility map, so treat the edge as approximate.

Community system · EPA id CO0162288 · filed with EPA as “FREDERICK TOWN OF”

Serves Frederick.

People served

17,173

Service connections

4,714

Primary source

Purchased surface water

Owner

Local government

Counties served

Weld

Water district

St. Vrain Creek

Its service area also reaches South Platte: Denver Gage to Greeley (17.0%).

Modelled boundary. EPA estimated this service area (Random Forest) rather than tracing a utility-supplied map; treat the edge as approximate. About 14 km².

Where the water comes from

Facility	Kind	Water
PURCHASED FROM CARTER LAKE 135476 SW	Consecutive connection (purchased)	Surface water · from CARTER LAKE FILTER PLANT

These are EPA's facility records, not DWR structures. Which decreed rights sit behind an intake is the next phase; nothing here is inferred.

Wholesale connections

Buys water from CARTER LAKE FILTER PLANT.

DWR structures that name this system

Source Probable join · fetched 2026-09-09 · matched on DWR's recorded contact or an EPA intake name; verify on the dossier

2 structures on DWR's record name this system as their contact (2). A match says who DWR lists, not who owns the water: a ditch company can own the headgate while the system owns shares, and a consultant can be the contact. The dossier holds the decree.

Structure	Type	Source	District	Matched on
LOWER BOULDER EXT RES 0604182	RESERVOIR	BOULDER CREEK	Boulder Creek	contact: FREDERICK, TOWN OF (WATSON, SARAH)
TOWN OF FREDERICK AUG 0602554	AUGMENTATION/REPLACEMENT PLAN	UNDEFINED	Boulder Creek	contact: FREDERICK, TOWN OF (WATSON, SARAH)

Compliance record

Source Register of another agency · fetched 2026-09-09 · verify at EPA ECHO ↗

2 violations open now, none health-based. These are monitoring, reporting or notice requirements — a sample not taken, or a result not filed on time. They are real obligations, but they are not a finding about the water itself.

EPA's own summary: violations in 12 of the last 12 quarters. In violation for, in EPA's words: 5000=Lead and Copper Rule; 7000=Consumer Confidence Rule. Currently: 5000=Lead and Copper Rule; 7000=Consumer Confidence Rule.

What happened

All 2 violation records on file, grouped into the 2 distinct things EPA's codes describe. Dates are the compliance period the violation is filed against.

Follow-up Or Routine LCR Tap M/R — Lead and Copper Rule monitoring and reporting 1 open

A required sample was not taken, or the result was not reported on time. 1 record, 2024-10-01.
Rule: Lead and Copper Rule -- corrosion of household plumbing.

CCR Complete Failure to Report — Consumer Confidence Rule other 1 open

A requirement other than a limit, a sample or a notice was not met. 1 record, 1999-10-19. Highest measured: 0.0 against a limit of 0.0.
Rule: Consumer Confidence Report -- the annual report to customers.

Every violation record, as filed (2 of 2)

Compliance period	What	About	Kind	Status	Measured
2024-10-01	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	monitoring and reporting	open
1999-10-19	CCR Complete Failure to Report	Consumer Confidence Rule	other	open	0.0 (limit 0.0)

What the regulator did about it

10 enforcement actions on this system's federal record. In Colorado the state is the primacy agency, so most actions are the state's; EPA acts directly on tribal systems and when it steps in.

Date	Action	By
2024-10-24	St Violation/Reminder Notice	state
2024-10-24	St Public Notif requested	state
2022-07-13	St Compliance achieved	state
2022-02-10	St Compliance achieved	state
2021-10-19	St Violation/Reminder Notice	state
2021-10-19	St Public Notif requested	state
2021-09-17	St Violation/Reminder Notice	state
2020-01-29	St Compliance achieved notice performed and sent to us on 1/29/2020. LAC 1/31/2020	state
2020-01-27	St Violation/Reminder Notice	state
2020-01-27	St Public Notif requested	state

Lead and copper

The latest 90th-percentile lead result is 0.0029 mg/L (sampling period ending 2025-12-31) against an action level of 0.015 mg/L, below it. 7 results on file.

The action level is not a health limit: it is the level at which the rule requires a system to act (corrosion control, public education, and in some cases replacing lead service lines). Lead mostly enters water from household plumbing, so a system-wide percentile does not tell you what comes out of one tap.

Violation, enforcement and lead/copper records are EPA SDWIS federal reporting, fetched monthly; the summary is EPA ECHO. Code names come from EPA's own REF_CODE_VALUE table. SDWIS carries violations, not routine sample results — nitrate, disinfection by-product and PFAS values are not in it, and a clean record here means nothing was reported as a violation, not that nothing was ever detected. For what was measured, ask the system for its Consumer Confidence Report.

PFAS and lithium: EPA's UCMR 5 monitoring, 2023–2025

Source Register of another agency · fetched 2026-09-09 · verify at EPA UCMR occurrence data ↗

8 samples, 120 results, 2025-01-15 to 2025-12-01. No PFAS was detected at the reporting limits; lithium was not detected.

Contaminant	Results	Highest, µg/L	Reporting limit
HFPO-DA	4	< 0.005	0.005
PFHxS	4	< 0.003	0.003
PFNA	4	< 0.004	0.004
PFOA	4	< 0.004	0.004
PFOS	4	< 0.004	0.004
lithium	4	< 9.0	9.0

Rows shown: every detected contaminant plus the regulated PFAS and lithium; the rest were below their reporting limits. These are UCMR monitoring samples, not compliance samples. EPA's April 2024 rule set 4.0 ng/L (0.004 µg/L) for PFOA and PFOS, the same as UCMR 5's reporting limit, so any detection of either is at or above it; the rule's compliance date and its other limits have been under revision since 2025 and are not applied here. State PFAS sampling is on CDPHE's pages ↗.

Common questions

Who provides drinking water in Frederick, Colorado?

The Town of Frederick is the public water system serving 17,173 people in Weld County, from purchased surface water. Its EPA public water system id is CO0162288.

Where does the Town of Frederick get its water?