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PATTISON 500

PWS ID: WA5366578 · Lacey, Washington 98503

PATTISON 500 serves 4,302 people in Lacey, Washington using Groundwater water sources. It has 67 recorded EPA violations, including 11 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: PATTISON 500

PATTISON 500 is a local-owned community water system that delivers drinking water to 4,302 residents in Lacey, Washington (Thurston County) through 1,865 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 67 total violations for this system , of which 11 (16%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 54 monitoring and reporting violations are on file. The most recent violation on record dates to 2012.

The most frequently cited contaminant at this system is Diquat, recorded in 15 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 Washington, EPA tracks 4,557 public water systems serving 9,736,844 people, with 314,648 cumulative violations and 20,590 health-based violations on record. About 92% of systems in the state carry at least one violation, and state-wide the average per system is 69 violations. PATTISON 500's 67 violations sit below the Washington average. Statewide, 98 of 247 UCMR5-tested systems have reported PFAS detections (39.7%). 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
4,302
Total Violations
67
Health-Based Violations
11
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,865
County
Thurston
School/Daycare
No
MCL Violations
11
Monitoring Violations
54
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Diquat MR 15 2005
Nitrate MR 13 2007
Coliform (TCR) MCL 11 1998
Coliform (TCR) MR 6 1994
Consumer Confidence Rule Other 2 2012
Chromium MR 2 2002
Arsenic MR 2 2002
Barium MR 2 2002
Mercury MR 2 2002
Cadmium MR 2 2002
Fluoride MR 2 2002
Selenium MR 2 2002
Gross Alpha, Excl. Radon and U MR 1 1979
Beryllium, Total MR 1 2002
Thallium, Total MR 1 2002
Antimony, Total MR 1 2002
Nickel MR 1 2002
CYANIDE MR 1 2002

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 395 samples detected PFAS.

Contaminant Date Result MRL Status
PFBS 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 4/20/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 4/20/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFHpS 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 4/20/2025 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 4/20/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 4/20/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 4/20/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 4/20/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 4/20/2025 <0.004 µg/L 0.004 µg/L Not Detected
NEtFOSAA 4/20/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFHpA 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 4/20/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 4/20/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 4/20/2025 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 4/20/2025 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 4/20/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 4/20/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 4/20/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
lithium 4/20/2025 <9 µg/L 9 µg/L Not Detected
NMeFOSAA 4/20/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFHxS 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 4/20/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 4/20/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 4/20/2025 <0.004 µg/L 0.004 µg/L Not Detected
NMeFOSAA 4/20/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFDoA 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 4/20/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFHpA 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
lithium 4/20/2025 <9 µg/L 9 µg/L Not Detected
PFTA 4/20/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 4/20/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFMBA 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 4/20/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 4/20/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 4/20/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 4/20/2025 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 4/20/2025 <0.003 µg/L 0.003 µg/L 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 PATTISON 500.

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 WA5366578 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Washington Drinking Water Authority

Washington State Department of Health — Office of Drinking Water is the primacy agency that licenses and inspects PATTISON 500 under EPA-delegated authority.

Open WA regulator portal

Source: Washington State Department of Health — Office of Drinking Water

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
2012 Consumer Confidence Rule Other 2 SDWIS / WA5366578 / 7000
2007 Nitrate MR 13 SDWIS / WA5366578 / 1040
2005 Diquat MR 15 SDWIS / WA5366578 / 2032
2002 Chromium MR 2 SDWIS / WA5366578 / 1020
2002 Arsenic MR 2 SDWIS / WA5366578 / 1005
2002 Barium MR 2 SDWIS / WA5366578 / 1010
2002 Mercury MR 2 SDWIS / WA5366578 / 1035
2002 Cadmium MR 2 SDWIS / WA5366578 / 1015
2002 Fluoride MR 2 SDWIS / WA5366578 / 1025
2002 Selenium MR 2 SDWIS / WA5366578 / 1045
2002 Beryllium, Total MR 1 SDWIS / WA5366578 / 1075
2002 Thallium, Total MR 1 SDWIS / WA5366578 / 1085
2002 Antimony, Total MR 1 SDWIS / WA5366578 / 1074
2002 Nickel MR 1 SDWIS / WA5366578 / 1036
2002 CYANIDE MR 1 SDWIS / WA5366578 / 1024

How PATTISON 500 Compares

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

Metric PATTISON 500 Washington avg Federal benchmark
Total violations 67 69 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 11 4.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 39.7% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 4,302 2,137 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 4,557 regulated public water systems in Washington.

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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is PATTISON 500 water safe to drink? ▼
PATTISON 500 (PWS ID: WA5366578) has 67 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 4,302 people using Groundwater sources.
How many people does PATTISON 500 serve? ▼
PATTISON 500 serves 4,302 people in Lacey, Washington. It is a Local-owned system using Groundwater water sources with 1,865 service connections.
What type of violations does PATTISON 500 have? ▼
PATTISON 500 has 67 total violations: 11 health-based violations (MCL exceedances or treatment failures), 54 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in PATTISON 500 water? ▼
No. PATTISON 500 was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does PATTISON 500 use? ▼
PATTISON 500 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.

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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.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial