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Community Water System · PWS ID3140013

Caldwell City Of

Caldwell, Idaho 83606 - drinking water served from groundwater sources to 74,000 people, tracked in EPA SDWIS and UCMR5.

74,000
People served
518
EPA violations
6
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 518 drinking-water violations at Caldwell City Of, 1% of them health-based - above the Idaho per-system average.

518
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
74,000
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Caldwell City Of

Caldwell City Of is a local-owned community water system that delivers drinking water to 74,000 residents in Caldwell, Idaho (Canyon County) through 25,000 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 518 total violations for this system , of which 6 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 510 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.

The most frequently cited contaminant at this system is Di(2-ethylhexyl) phthalate, recorded in 14 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

Across Idaho, EPA tracks 2,005 public water systems serving 1,743,912 people, with 104,850 cumulative violations and 19,965 health-based violations on record. About 96% of systems in the state carry at least one violation, and state-wide the average per system is 52.3 violations. Statewide, 40 of 60 UCMR5-tested systems have reported PFAS detections (66.7%).

Caldwell City Of's 518 violations sit above the Idaho average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
74,000
Total Violations
518
Health-Based Violations
6
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
25,000
County
Canyon
School/Daycare
No
MCL Violations
6
Monitoring Violations
510
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Di(2-ethylhexyl) phthalate MR 14 2020
Diquat MR 13 2020
Di(2-ethylhexyl) adipate MR 13 2020
Dinoseb MR 13 2020
Heptachlor MR 13 2020
Heptachlor epoxide MR 13 2020
2,4-D MR 13 2020
Pentachlorophenol MR 13 2020
Total Polychlorinated Biphenyls (PCB) MR 13 2020
ETHYLENE DIBROMIDE MR 13 2020
Chlordane MR 13 2020
Toxaphene MR 13 2020
Dalapon MR 13 2020
Endothall MR 13 2020
Glyphosate MR 13 2020
OXAMYL MR 13 2020
Picloram MR 13 2020
Hexachlorocyclopentadiene MR 13 2020
Carbofuran MR 13 2020
LASSO MR 13 2020
2,4,5-TP MR 13 2020
1,2-DIBROMO-3-CHLOROPROPANE MR 13 2020
Atrazine MR 13 2020
Methoxychlor MR 13 2020
Endrin MR 13 2020
BHC-GAMMA MR 13 2020
HEXACHLOROBENZENE MR 13 2020
Simazine MR 13 2020
Benzo(a)pyrene MR 12 2020
Radium-226 MR 10 2010

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 841 samples detected PFAS.

Contaminant Date Result MRL Status
PFTA 6/26/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 6/26/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 6/26/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 6/26/2023 <6.00 ppt 6.00 ppt Not Detected
PFMBA 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 4/26/2023 <2.00 ppt 2.00 ppt Not Detected
PFTA 4/26/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 4/26/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 4/26/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 4/26/2023 <6.00 ppt 6.00 ppt Not Detected
PFBS 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 4/26/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 4/26/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 4/26/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 4/26/2023 <20.00 ppt 20.00 ppt Not Detected
PFHxA 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 4/26/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 4/26/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 4/26/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 4/26/2023 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 4/26/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 4/26/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 4/26/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 4/26/2023 <4.00 ppt 4.00 ppt Not Detected
PFDoA 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 4/26/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 4/26/2023 <7.00 ppt 7.00 ppt Not Detected
PFTA 4/26/2023 <8.00 ppt 8.00 ppt Not Detected
PFHpS 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 4/26/2023 <20.00 ppt 20.00 ppt Not Detected
PFMBA 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 4/26/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 4/26/2023 <4.00 ppt 4.00 ppt Not Detected
4:2 FTS 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 4/26/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeS 4/26/2023 <4.00 ppt 4.00 ppt Not Detected
PFBA 4/26/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeA 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 4/26/2023 <5.00 ppt 5.00 ppt Not Detected
PFEESA 4/26/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 4/26/2023 <6.00 ppt 6.00 ppt Not Detected
PFNA 4/26/2023 <4.00 ppt 4.00 ppt Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Caldwell City Of.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID ID3140013 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Idaho Drinking Water Authority

Idaho's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find ID regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2020 Di(2-ethylhexyl) phthalate MR 14 SDWIS / ID3140013 / 2039
2020 Diquat MR 13 SDWIS / ID3140013 / 2032
2020 Di(2-ethylhexyl) adipate MR 13 SDWIS / ID3140013 / 2035
2020 Dinoseb MR 13 SDWIS / ID3140013 / 2041
2020 Heptachlor MR 13 SDWIS / ID3140013 / 2065
2020 Heptachlor epoxide MR 13 SDWIS / ID3140013 / 2067
2020 2,4-D MR 13 SDWIS / ID3140013 / 2105
2020 Pentachlorophenol MR 13 SDWIS / ID3140013 / 2326
2020 Total Polychlorinated Biphenyls (PCB) MR 13 SDWIS / ID3140013 / 2383
2020 ETHYLENE DIBROMIDE MR 13 SDWIS / ID3140013 / 2946
2020 Chlordane MR 13 SDWIS / ID3140013 / 2959
2020 Toxaphene MR 13 SDWIS / ID3140013 / 2020
2020 Dalapon MR 13 SDWIS / ID3140013 / 2031
2020 Endothall MR 13 SDWIS / ID3140013 / 2033
2020 Glyphosate MR 13 SDWIS / ID3140013 / 2034

How Caldwell City Of Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Caldwell City Of Idaho avg Federal benchmark
Total violations 518 52.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 6 10 Indicates a contaminant exceeded a federal MCL
PFAS detection None 66.7% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 74,000 870 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,005 regulated public water systems in Idaho.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Caldwell City Of water safe to drink? ▼
Caldwell City Of (PWS ID: ID3140013) has 518 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 74,000 people using Groundwater sources.
How many people does Caldwell City Of serve? ▼
Caldwell City Of serves 74,000 people in Caldwell, Idaho. It is a Local-owned system using Groundwater water sources with 25,000 service connections.
What type of violations does Caldwell City Of have? ▼
Caldwell City Of has 518 total violations: 6 health-based violations (MCL exceedances or treatment failures), 510 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Caldwell City Of water? ▼
No. Caldwell City Of was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Caldwell City Of use? ▼
Caldwell City Of uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.