气味信息

Q: Where do odors come from?

Regional odors do not just come from the WPWMA’s campus. While the WPWMA is often the most visible source of odors, there are many other potential odor sources nearby, including dairy and poultry farms, wastewater treatment plants, wood waste plants, major construction projects, and the WPWMA’s operations. At the WPWMA, the overwhelming majority of odors come from our composting operation, not the landfill itself. As part of the WPWMA’s $120 million facility improvement project, we constructed new composting facilities for green waste and food waste designed to reduce offsite odor potential by 84% and 95%, respectively. The WPWMA will conduct occasional odor studies to assess the impact of offsite odors and is planning to conduct a new study in 2027 to examine how these recent improvements have changed regional odor conditions.

Q: What should I do if I notice a strong odor?

Let us know! We encourage residents to submit an Odor Notification form as soon as you’re experiencing the odor to help us investigate it most effectively. Odor Notifications help us identify where an odor may be coming from (at the WPWMA or somewhere else in the region) and investigate any conditions that could have exacerbated it.

Q: Is the landfill ever going to move?

Never. Due to extreme costs and logistical issues, it is nearly impossible to excavate and entirely move landfills. When a landfill site is closed (no longer accepting waste), protective liner layers and final soil caps are placed over any waste, and the site must be monitored for at least 30 years. The WPWMA develops the landfill in 20-acre areas, called modules or cells, designed to last approximately 10 to 15 years each. As each module fills, the WPWMA periodically “closes” areas of the landfill over time.

Q: Does everything I throw away in my garbage bin go straight to the landfill?

Absolutely not! In Placer County, all trash, recyclables, and food scraps are collected together in one bin and are all sorted at a Materials Recovery Facility (MRF), guaranteeing valuable recyclable and compostable materials are kept out of the landfill.

那是什么味道？WPWMA 设施周围的气味管理

尽管气味是分解有机物时自然且不可避免的副产品，但 WPWMA 还是采取了广泛的措施来主动减少场外气味的可能性。

我们采用一套气味监测系统，旨在持续测量WPWMA校园内外多个地点特定气味及其强度。这些数据与现场气象站数据相结合，生成测量和估计气味的空气扩散模型。.

WPWMA 工作人员持续监测设施运行情况和天气状况，努力识别并最大程度地减少潜在的异味来源。异味监测系统用于协助调查已报告的异味情况，更好地了解可能对社区造成异味影响的运营条件和气象条件组合，并评估特定异味减少措施的相对有效性。

全场气味计划

WPWMA 与普莱瑟县空气污染控制区合作制定了场地气味计划（SWOP）是供WPWMA及其设施运营商、承包商、顾问和承租人使用的工具，用于减少场外异味的可能性。该计划于2020年12月获得WPWMA董事会批准，并于2025年1月进行了最新更新。

SWOP 提供了关于设施异味来源的简明信息。WPWMA 以 SWOP 为指南，监测可能加剧异味的运行和气象条件。SWOP 还包含 WPWMA 可以采取的措施，以降低设施异味产生的可能性。

September 2026 - Anticipated Regional Manure Odor

September 18, 2026 – Heads up, Western Placer neighbors – The WPWMA has received notice that a neighboring farmer has had a significant amount of manure delivered and plans to spread it over the next few weeks, which may result in unpleasant odors in the area.

Because this anticipated odor does not originate from the WPWMA’s facilities/operations, unfortunately we are unable to mitigate or prevent it. Agriculture is a protected practice in both California and Placer County, and local farmers have a Right to Farm.

You may submit ag-related odor notifications to the Placer Air Pollution Control District (https://www.placerair.org/1692/Complaints) or, if you believe an odor is originating from a solid waste operation, the WPWMA (https://www.surveymonkey.com/r/YRB5R2Q).

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Questions From Our Neighbors

Answers to the WPWMA’s Frequently Asked Questions about facility operations and long-term plans.

Where do odors come from?

Regional odors do not just come from the WPWMA’s campus. While the WPWMA is often the most visible source of odors, there are many other potential odor sources nearby, including dairy and poultry farms, wastewater treatment plants, wood waste plants, major construction projects, and the WPWMA’s operations. At the WPWMA, the overwhelming majority of odors come from our composting operation, not the landfill itself. As part of the WPWMA’s $120 million facility improvement project, we constructed new composting facilities for green waste and food waste designed to reduce offsite odor potential by 84% and 95%, respectively. The WPWMA will conduct occasional odor studies to assess the impact of offsite odors and is planning to conduct a new study in 2027 to examine how these recent improvements have changed regional odor conditions.

What is the WPWMA doing to reduce odors?

Reducing the impact of our operations on our neighbors is a priority. As outlined in our 场地气味计划 (SWOP), the WPWMA’s staff and contractors operate according to best management practices designed to reduce the potential for odors to travel offsite. For example, we cover highly odiferous food waste within one hour of being dropped off at our composting facility. Our staff also monitors weather conditions, utilizes early-detection odor sensors, and runs projections in modeling software.

What should I do if I notice a strong odor?

Let us know! We encourage residents to submit an Odor Notification form as soon as you’re experiencing the odor to help us investigate it most effectively. Odor Notifications help us identify where an odor may be coming from (at the WPWMA or somewhere else in the region) and investigate any conditions that could have exacerbated it.

When is the landfill going to be full?

The WPWMA has 100+ years of remaining capacity for our landfill sites, based on current projections. Additionally, the WPWMA continues to invest in technologies and practices that reduce impacts and expand the lifetime of the landfill.

Is the landfill ever going to move?

Never. Due to extreme costs and logistical issues, it is nearly impossible to excavate and entirely move landfills. When a landfill site is closed (no longer accepting waste), protective liner layers and final soil caps are placed over any waste, and the site must be monitored for at least 30 years. The WPWMA develops the landfill in 20-acre areas, called modules or cells, designed to last approximately 10 to 15 years each. As each module fills, the WPWMA periodically “closes” areas of the landfill over time.

Does everything I throw away in my garbage bin go straight to the landfill?

Absolutely not! In Placer County, all trash, recyclables, and food scraps are collected together in one bin and are all sorted at a Materials Recovery Facility (MRF), guaranteeing valuable recyclable and compostable materials are kept out of the landfill.

Is the WPWMA just a landfill?

No! While the landfill is certainly our largest facility, the WPWMA’s campus is home to many more facilities. We recover recyclables at the MRF, turn organic materials (like food scraps and green waste) into compost, recycle construction debris, capture methane gas at the landfill to produce renewable electricity, and run a public disposal facility where residents can drop off general refuse for a 费用 and separated recyclables, Household Hazardous Waste (HHW), & electronic waste for FREE!

2025年区域气味问题

更新日期：2025年11月2日 我们注意到普莱瑟西部地区的异味显著增加。经调查并参考最佳实践后，WPWMA 确定，这种区域性异味并非源自 WPWMA 园区，而是来自我们设施西北方向的一个农场，该农场近期施用了大量粪便。

过去几年，除了确保每天遵循SWOP中描述的最佳实践外，WPWMA还大力投资于除臭技术和基础设施，以便更好地与附近的居民和企业保持良好关系：

作为其中的一部分设施改进项目WPWMA 拥有一台新的 ColdOx 机器，可以杀死引起异味的物质（称为挥发性有机化合物，或 VOC）。
现在，食物残渣采用一种称为覆盖式曝气静态堆肥 (CASP) 的方法进行堆肥，通过完全覆盖的堆肥和地下曝气沟，可以减少超过 90% 的气味。
绿色垃圾现在采用曝气静态堆肥（ASP）进行堆肥，与传统的“条垛式”堆肥相比，可减少高达 84% 的气味。
WPWMA参与了加州大学戴维斯分校和加州空气资源委员会（CARB）的一项研究，该研究旨在探索最佳实践和新工具，以进一步减少垃圾填埋场的排放。虽然这项研究仍在进行中，但我们已经从WPWMA的垃圾填埋场看到了令人鼓舞的成果。

你可以这样做：

请不要向WPWMA报告这种气味，向普莱瑟空气污染控制区报告。谁有权调查场外异味事件？由于异味源自WPWMA设施之外，WPWMA很遗憾无法消除异味。
观看最近举办的气味研讨会（右侧视频），了解更多关于 WPWMA 全场气味控制计划和区域气味来源的信息。
倡导要求业主在进行可能对区域气味状况产生极大影响的活动（例如撒粪）时，必须通知附近的居民。